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Michael J. Joyner

Michael J. Joyner

Michael J. Joyner, M.D., is a physiologist and anesthesiologist at the Mayo Clinic and a leading voice in the world of exercise physiology. Over the past 25-plus years, he's published hundreds of studies, many of which have focused on how humans respond to exercise. Dr. Joyner also writes at Human Limits. The views expressed in his posts are his own and do not reflect those of his employer.


There’s a number that controls your fitness destiny. And odds are you’re not doing enough to improve it.

Michael J. Joyner
Nov 8, 2013

Sometimes, what's common knowledge doesn't need scientific validation. Listen to the advice of these two legendary athletes and remember that even the strongest of us need a little rest and relaxation.

Michael J. Joyner
Oct 24, 2013

Need to manage your cholesterol while you exercise? Think twice before taking statins.

Michael J. Joyner
Oct 21, 2013

Why It's Impossible to Just Eat Less

The formula to weight loss is simple: eat less and exercise more. So why are these simple things so impossibly hard to do?

Michael J. Joyner
Oct 16, 2013

The Paleo Endurance Secret

Paleo diets are supposed to be bad for your endurance. What if they aren't?

Michael J. Joyner
Oct 11, 2013

Are Ultra-Distance Athletes Special?

Is there something special about the physiology of ultra-distance athletes and what can we learn from how they train?

Michael J. Joyner
Oct 8, 2013

Cracking the Sub-Two-Hour Marathon

A new record has been set in the marathon, edging us 15 seconds closer to the two-hour mark. Will we get any faster?

Michael J. Joyner
Sep 30, 2013

Why You Need to Do Burpees

Exercise isn't enough. To remain healthy, you need to build athleticism. Here's how.

Michael J. Joyner
Sep 23, 2013

When Exercise Turns Deadly

We're told to exercise to stay fit and healthy, but sometimes training routines turn deadly.

Michael J. Joyner
Sep 23, 2013

Lessons from Bruce Springsteen

Not all celebrities are train wrecks. Sometimes, they're perfect examples of what we all should be doing to stay healthy and happy.

Michael J. Joyner
Sep 19, 2013

Can You Get Too Much Exercise?

We know too much time spent on the couch is deadly, but what about the hours you spend in the saddle or on the trail? Is there really such thing as too much exercise?

Michael J. Joyner
Sep 6, 2013

The Right Way to Interval Train

Interval training is no longer the secret of the pros, but that doesn't mean you're doing it right

Michael J. Joyner
Sep 1, 2013