There are several reasons why you might feel muscle soreness — but workout quality is not one of them.
It's possible — but the fitter you are, the harder it might be.
Measuring heart rate variability (HRV) used to involve a doctor’s visit. Now you can use smartphone applications to measure, track, and evaluate HRV on your own.
Sure — if it's done correctly. Here are some tips.
Wondering if you should hit the gym after a drink or two? Here's what the research says.