The general rule is the heavier the weight, the longer the rests. If you are using weights that cause you to reach muscular failure in 6 reps or so, then rests as long as 3 minutes between sets are reasonable. If you are doing 8-10 reps to failure, then 2 minute rests. If you are doing 12 or more reps then 1 minute rests. There is no hard and fast rule but this is the general idea -- length of rests is proportional to the weight lifted. If you are not training to failure then normally you'd take short rests of 60-90 seconds, unless you are on a strength-specific program which usually prescribes much longer rests to allow full muscle recovery. |