A typical strength- or muscle-building workout happens in sets. You lift the weight a certain number of times (“reps”), then you put it down for a quick rest before going again. But how long should ...

If you asked someone what the optimal time to rest between sets is, odds are they would say somewhere between 60-90 seconds. A personal training certification manual or old bodybuilding book would ...

Add Yahoo as a preferred source to see more of our stories on Google. If you asked someone what the optimal time to rest between sets is, odds are they would say somewhere between 60-90 seconds. A ...