Originally Posted by hannukah harry

if you're doing 30 situps and then another 30 and then another 30 and then 2 more exercises, then you're not exercising them properly. if you want to build muscle, any muscle, then you have to work them not to fatigue, but to overload. you need to overload them so that the fibers breakdown and are rebuilt. which is why there's the 48 hour rest. so they can heal and rebuild stronger. if you're doing the 30/30/30 etc. all you're doing is fatigueing you're muscles, building aerobic endurance, but not doing much to increase their strength or size (and dman2 is interested in his being seen and the bigger they are, the thicker layer of subcutaneous abdominal fat that they may be able to be seen through). you're way is aerobically burning glucose. any soreness and fatigue you get from it will be from lactic acid, not muscle breakdown.