I've been reading about strength training but most of the stuff I've come across deals with building size as well as strength. I've got my cardiovascular fitness almost sorted but the next stage for me is strength training. What is the best way to remain slim while gaining strength and good muscle tone? Of course, conventional wisdom states that one must rest between strength training sessions in order for muscles to grow. But what if the aim is to not develop the size as such, but the strength? Currently, I'm working out in the gym using light weights (both free and machine) and doing some bodyweight exercises. Yesterday I did a session on the weights and today, while aching slightly, I feel I could it again. So, were I to go to the gym two days in succession, and using light weights, would I be putting back progress strength wise? I'm not talking about doing the weights seven days a week, but is it feasible to do, say, two days on, one day off, two days on (using light weights, remember), etc? Cheers.