*does some proper exercise*
*thinks "hey this is alright, I'll do this regularly from now on. Preferably daily, at least a few times a week" *
*does nothing for a few weeks*
*repeats*
As to uni, I generally intended to start revision way earlier than I did. Worked out alright but yeah. Sometimes my good intentions were met...like I went to pool one night, had an exam the following day I knew very little for, I convinced myself I'd wake up a few hours earlier (5am or so) to go over definitions and such, and I did. Got like 78 or something.