do not work on muscles that are still recovering. When you first train an area that hasn't been trained for a long time or ever it can take a week to recover. Next time it will recover quicker, soon you will be able to train every 2 days. Body builders have split routines for this reason so you can train every day if you like but you should do unrelated muscles. so for example chest/triceps on day one and back/biceps day 2, shoulders/traps day 3, legs day 4, then start again.