The energy source being used during the training session is probably the most important factor to consider. During the maximum strength phase, when you are primarily using the ATP/CP energy pathway, daily training is possible because ATP/CP restoration is completed within 24 hours.
If you are training for muscular endurance (muscle definition) then you require a 48 hour recovery as this is how long it takes to fully restore your glycogen stores (Piehl, 1974; Fox et al, 1989).
- As a 'rule of thumb' 48 hours should elapse between sessions.
If training strenuously, any athlete will find it extremely difficult to maintain the same level of lifting at each session, and the total poundage lifted in each session would be better to be varied (e.g. a high, low and medium volume session) each week.