The workout is the request. The day after is when your body fills it. Skip the day after and you keep placing orders nobody has time to build.
A hard session knocks you down a little. Rest brings you back a little higher than before. Train again before you've come back up and the line goes the wrong way.
Rest means no hard training. It doesn't mean no moving.
Because some of you only gets fed when it moves.
One of these is a normal Tuesday. Three at once is your body asking for a day.
For most people lifting two to four days a week.
Short answers.
Pick one.