When your body uses up the energy it takes to complete a hard workout, it’s like digging a hole.Before you can make any progress, that hole has to be filled back in—the energy you used has to be replaced. Once that’s over with, then, and only then, can your body over-compensate by building new muscle tissue.
Your body needs time to fill that hole in—typically 48 to 72 hours. If you work out again before the process is completed, you will not get any benefit from that workout.
Tip: Never work out 2 days in a row, and never more than 2-3 times per week. You will make faster progress, you’ll feel a lot better, and you’ll be more likely to stick with your program for the long term.