singertrainers

As a kid, I spent many Saturdays romping around my Florida neighborhood imitating Colonel Steve Austin, better known as The Six Million Dollar Man to avid TV watchers in the 1970s.

The popular show featured a bionic man — half human and half machine — who could jump from three-story buildings, leap over six-foot-high walls, and bolt into a full 60-mile-per-hour sprint. Naturally, these actions occurred in slow motion with an iconic vibrating electronic sound effect.

My own bionic moves involved jumping to pluck oranges from tree branches, hopping over anthills, and leaping across narrow ditches while humming that distinctive sound. I didn’t realize it, but this imitation game taught me the foundations of plyometrics — the popular training routine now used by top athletes to boost strength, power, and agility.

What are plyometrics?

Plyometric training involves short, intense bursts of activity that target fast-twitch muscle fibers in the lower body. These fibers help generate explosive power that increases speed and jumping height.

“Plyometrics are used by competitive athletes who rely on quick, powerful movements, like those in basketball, volleyball, baseball, tennis, and track and field,” says Thomas Newman, lead performance specialist with Harvard-affiliated Mass General Brigham Center for Sports Performance and Research. Plyometrics also can help improve coordination, agility, and flexibility, and offer an excellent heart-pumping workout.

Who can safely try plyometrics?

There are many kinds of plyometric exercises. Most people are familiar with gym plyometrics where people jump onto the top of boxes or over hurdles.

But these are advanced moves and should only be attempted with the assistance of a trainer once you have developed some skills and muscle strength.

Keep in mind that even the beginner plyometrics described in this post can be challenging. If you have had any joint issues, especially in your knees, back, or hips, or any trouble with balance, check with your doctor before doing any plyometric training.

How to maximize effort while minimizing risk of injury

• Choose a surface with some give. A thick, firm mat (not a thin yoga mat); well-padded, carpeted wood floor; or grass or dirt outside are good choices that absorb some of the impact as you land. Do not jump on tile, concrete, or asphalt surfaces.
• Aim for just a few inches off the floor to start. The higher you jump, the greater your impact on landing.
• Bend your legs when you land. Don’t lock your knees.
• Land softly, and avoid landing only on your heels or the balls of your feet.

Three simple plyometric exercises

Here are three beginner-level exercises to jump-start your plyometric training. (Humming the bionic man sound is optional.)

Side jumps

Stand tall with your feet together. Shift your weight onto your right foot and leap as far as possible to your left, landing with your left foot followed by your right one. Repeat, hopping to your right. That’s one rep.

• You can hold your arms in front of you or let them swing naturally.
• Try not to hunch or round your shoulders forward as you jump.
• To make this exercise easier, hop a shorter distance to the side and stay closer to the floor.

Do five to 15 reps to complete one set. Do one to three sets, resting between each set.

Jump rope

Jumping rope is an effective plyometric exercise because it emphasizes short, quick ground contact time. It also measures coordination and repeated jump height as you clear the rope.

• Begin with two minutes of jumping rope, then increase the time or add extra sets.
• Break it up into 10- to 30-second segments if two minutes is too difficult.
• If your feet get tangled, pause until you regain your balance and then continue.

An easier option is to go through the motions of jumping rope but without the rope.

Forward hops

Stand tall with your feet together. Bend your knees and jump forward one to two feet. Turn your body around and jump back to the starting position to complete one rep.

• Let your arms swing naturally during the hop.
• To make this exercise easier, hop a shorter distance and stay closer to the floor.
• If you want more of a challenge, hop farther and higher. As this becomes easier to do, try hopping over small hurdles. Begin with something like a stick and then increase the height, such as with books of various thicknesses.

Do five to 10 hops to complete one set. Do one to three sets, resting between each set.

About the Author

Matthew Solan, Executive Editor, Harvard Men's Health Watch

Matthew Solan is the executive editor of Harvard Men’s Health Watch. He previously served as executive editor for UCLA Health’s Healthy Years and as a contributor to Duke Medicine’s Health News and Weill Cornell Medical College’s … See Full Bio View all posts by Matthew Solan

About the Reviewer

Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing

Dr. Howard LeWine is a practicing internist at Brigham and Women’s Hospital in Boston, Chief Medical Editor at Harvard Health Publishing, and editor in chief of Harvard Men’s Health Watch. See Full Bio View all posts by Howard E. LeWine, MD

If your fingers or toes ever turn pale (or even ghostly white) and go numb when exposed to cold, you might assume you just have poor circulation. That’s what I used to think when I first started noticing this problem with my own hands many years ago.

It usually happened near the end of a long hike on a spring or fall afternoon, when the temperature dropped and I didn’t have any gloves handy. My pinkie, third, and middle fingers would turn white, and the fingernails took on a bluish tinge. As I soon discovered, I have Raynaud’s phenomenon, an exaggeration of normal blood vessel constriction.

Raynaud’s phenomenon: Beyond poor circulation

When you’re exposed to a cold environment, your body reacts by trying to preserve your core temperature. Blood vessels near the surface of your skin constrict, redirecting blood flow deeper into the body. If you have Raynaud’s phenomenon, this process is more extreme.

Is wintry weather the only trigger for Raynaud’s phenomenon?

“Cold weather is the classic trigger for Raynaud’s phenomenon," says rheumatologist Dr. Robert H. Shmerling, senior faculty editor at Harvard Medical School's Harvard Health Publishing.

"But it can occur any time of year — for example, when you come out of a heated pool, walk into an air-conditioned building, or reach into the freezer section at the supermarket. Even slight changes in air temperature can trigger an episode.”

What happens when an episode occurs?

During an episode, the small arteries supplying the fingers and toes contract spasmodically, hampering the flow of oxygen-rich blood to the skin. Some of these vessels even temporarily collapse, and the skin becomes pale and cool, sometimes blanching to a stark white color.

In addition to the hands, Raynaud’s can also affect the feet. Less often, the nose, lips, and ears.

Is Raynaud’s phenomenon a circulation problem?

Technically, Raynaud’s phenomenon is a circulation problem, but it’s very different than what doctors typically mean by poor circulation, says Dr. Shmerling. Limited or poor circulation usually affects older people whose arteries are narrowed with fatty plaque (known as atherosclerosis). This condition is often caused by high cholesterol, high blood pressure, and smoking.

In contrast, Raynaud’s usually affects younger people (mostly women) without those issues. And the circulation glitch is generally temporary and completely reversible, he adds.

How can you prevent episodes?

As I can attest, the best treatment for this condition is to prevent episodes in the first place, mainly by avoiding sudden or unprotected exposure to cold temperatures. I’ve always bundled up in the winter before heading outside, but now I bring extra layers and gloves even when the temperature might dip even slightly, or the weather may turn rainy or windy. Preheating the car in winter before getting in, and wearing gloves in chilly grocery store aisles, can also help.

Generally, it’s best to avoid behavior and medicines that cause blood vessels to constrict. This includes not smoking and not taking certain medications, such as cold and allergy formulas that contain pseudoephedrine and migraine drugs that contain ergotamine. Emotional stress may also provoke an episode of Raynaud’s, so consider tools and techniques that can help you ease stress, such as mindfulness techniques.

If necessary, your doctor may prescribe a medication that relaxes the blood vessels, usually a calcium-channel blocker such as nifedipine (Adalat, Procardia). If that’s not effective, drugs to treat erectile dysfunction such as sildenafil (Viagra) may help somewhat. Other treatment options include losartan (Cozaar), fluoxetine (Prozac), and topical nitroglycerin. You may only need to use these medications during the cold season, when Raynaud’s tends to be worse.

What steps may help during an episode?

Once an episode starts, it’s important to warm up the affected extremities as quickly as possible. For me, placing my hands under warm running water does the trick.

When that’s not possible, you can put them under your armpits or next to another warm part of your body. When the blood vessels finally relax and blood flow resumes, the skin becomes warm and flushed — and very red. The fingers or toes may throb or tingle.

Is Raynaud’s phenomenon linked to other health problems?

Some people with Raynaud’s phenomenon have other health problems, usually connective tissue disorders such as lupus or scleroderma. Your doctor can determine this by reviewing your symptoms, performing a physical exam, and taking a few blood tests. But most of the time, there is no underlying medical problem.

About the Author

Julie Corliss, Executive Editor, Harvard Heart Letter

Julie Corliss is the executive editor of the Harvard Heart Letter. Before working at Harvard, she was a medical writer and editor at HealthNews, a consumer newsletter affiliated with The New England Journal of Medicine. She … See Full Bio View all posts by Julie Corliss

About the Reviewer

Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing

Dr. Howard LeWine is a practicing internist at Brigham and Women’s Hospital in Boston, Chief Medical Editor at Harvard Health Publishing, and editor in chief of Harvard Men’s Health Watch. See Full Bio View all posts by Howard E. LeWine, MD

As the new year rolls on, sports fans rejoice! You’ve had the excitement of the college football bowl games and the national championship game, the NFL playoff games are winnowing teams down to the Super Bowl contestants, and basketball and hockey seasons are in full swing. Spring training for the upcoming Major League Baseball season is around the corner.

But hold these thoughts a moment. Watching sports — not just playing them — can be hazardous to your health. I’ve seen it firsthand while working in a walk-in clinic near Fenway Park, where people would show up bleeding from cuts that needed stitches (from trips and falls at the stadium), broken bones (from trying to catch a foul ball or an altercation with another fan), and dehydration.

Most of these injuries weren’t life-threatening. But there’s evidence that the health impact of sports spectatorship can be far more serious for some of us — and, perhaps, underappreciated.

What are the health risks of watching live sports?

When you’re watching games in person, some risks are related to the weather and other fans. For example:

• Watching a baseball game in the summer for hours may lead to heat stroke or dehydration.
• Live winter football games may raise the risk of hypothermia, frostbite, or other cold-related problems.
• Stampedes, riots, and brawls between rival fans watching soccer matches are not rare and may actually be on the rise.
• And, as mentioned, spectators of live sports can be injured by balls hit into the stands or other flying objects such as bats, pucks, or golf balls.

How could watching sports on TV boost health risks?

Doctors and nurses often describe how quiet things get in the emergency room during a World Series game or the Super Bowl. But once the game ends, it tends to get much busier. One theory is that people with chest pain, trouble breathing, or other symptoms of a potentially serious problem who ordinarily would have reported to the emergency room right away may delay seeking care until after the game.

Of course, there’s another possibility: the game itself — especially if a game is close and particularly exciting — might cause enough stress on the body that heart attacks, strokes, or other dangerous conditions develop.

Research supporting the idea that watching sports can negatively affect your health includes:

• Older studies have linked hospital admissions for heart failure and cardiac arrest with watching sporting events.
• A 2017 study found that spectators of Montreal Canadiens hockey games experienced a doubling of their heart rate during games. The effect was more pronounced for live games than televised games, but even the latter experience led to faster heart rates similar to the effect of moderate exercise.
• A 2022 study found that hospital admissions for cardiovascular problems jumped 15% during and just after World Cup soccer games.

Together, these studies suggest that watching sports can be stressful enough to trigger dangerous cardiovascular events.

It’s worth emphasizing that most people watching sports enjoy it and do not experience any health problems related to the game. But these studies suggest that spectating may carry some small risk, similar to what might accompany moderate or vigorous exercise. This may be most relevant for people who are older or who already have cardiovascular disease.

What’s a sports fan to do?

One common recommendation is to remember that it’s only a game. Of course, if you care a lot about sports or a particular team, that advice is unlikely to help. A second is to get regular exercise. Staying physically active strengthens the heart and lowers blood pressure, which could help ward off some of the health risks described above.

Five additional game-day precautions are:

• Avoid overeating, especially salty junk food. For some, overindulging in food, drink, and salt can stress the heart or trigger heart failure.
• Be prepared for the weather. Check the forecast. If you’re planning to watch a game in the cold, dress in layers, use hand warmers, and drink warm fluids. If you’re going to be out in the sun, use sunscreen liberally, wear a hat, and hydrate well.
• If you have cardiovascular disease, don’t forget to take your medications, especially if there’s a big game coming up. And if you develop worrisome symptoms, such as chest pain or trouble breathing, seek medical attention right away. Don’t wait till the game ends!
• Stay hydrated and moderate your alcohol intake. Stay well-hydrated by drinking water, especially if you’re out in the heat for hours. Although beer is a liquid, it’s also a diuretic, meaning it can make you urinate more and lose more fluids than other beverages.
• Stay alert at live events. Give yourself a fighting chance of getting out of the way of a line-drive foul ball or an errant bat that’s slipped out of the batter’s hands during a swing.

The bottom line

I can attest to many upsides of watching sports: the excitement of competition and the bonding and camaraderie with likeminded friends, family, and other fans. And perhaps watching sports might improve your health if sports spectatorship sparks sports participation.

While watching sports has been linked to certain health risks, the overall risk is likely low for most people. And you can take steps to reduce this. The health risks of spectatorship only rarely require giving up watching a favorite team. So, put on your team jersey, cheer your team on to victory, and stay healthy while you’re at it. Oh, and watch out for outraged fans or flying bats.

About the Author

Robert H. Shmerling, MD, Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. … See Full Bio View all posts by Robert H. Shmerling, MD