We all know people who undermine themselves by overdoing their occasional workouts. They get so sore/exhausted they spend the next days (or weeks) resting and recovering. They never get comfortable with workouts because they don’t show up often enough to get over the sometimes intense soreness a new start brings.
If you’re serious about getting and staying in shape it’s a much better thing to start slowly and gently. If you throw yourself into a miserable state each time you hit the gym there’s no way you’re going to look forward to going. A hard workout after a long layoff isn’t going to do you any favors in terms of enjoyment (particularly in the following days). A slow, steady, sustained approach will ease you into the fitness lifestyle. You’ll enjoy it much more and you’ll be much more likely to stick with it and therefore get the results you’re looking for. Better to do a little each day than go crazy straining yourself now and then.
Slow and steady wins the race!