It depends on:
- Your body type
- Diet
- Exercise regimen
If you are trying to lose weight as far as fat cells go, the more aerobic/cardio exercise the better. If you are wanting to lose fat and gain muscle, it is good to alternate. A good rule of thumb for muscle gain/fat loss diet is --
- Monday - Weights (full body or for example: chest, biceps, triceps, shoulders)
- Tuesday - at least 45 minutes of cardiovascular/aerobic exercise
- Wednesday - Weights (full body or for example: abs, back, obliques, butt)
- Thursday - at least 45 minutes of cardiovascular/aerobic exercise
- Friday - Weights (full body or for example: (quads, hamstrings, calves, butt)
- Saturday - light cardio/aerobic or REST DAY
- Sunday - REST DAY