A new study compares active and passive interval recoveries, but physiology isn’t the only factor to consider.
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This workout will help you zero in on relaxed speed and build muscular endurance.
Three types of training that will improve your speed, stride, and stamina, but won't burn you out.
Do a lot, but don't do too much.
All the physiological proof you need that you should definitely be doing hill repeats if you're trying to become a more efficient, faster, and injury-free runner.
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