Never miss a Monday: Working out on a Monday helps us reset after the weekend and sets us up for the week ahead psychologically, physiologically and hormonally. About four hours after a good workout our body will feel great and ready to go again, which spurs us on to train on Tuesday and Wednesday. Planning our key sessions early in the week means we’re less likely to get derailed by all those social occasions that tend to crop up on Thursday, Friday and the weekend.