The concept of improving one's fitness is quite simple, yet not easy. An individual should find a form of exercise that is Safe, can be done in an Efficient time frame and produces Effective results. Of course, there should always be an element of fun to keep things interesting as well as challenging enough to keep you wanting to come back for more.
I witnessed a workout just the other day where a woman proceeded to perform bodyweight squats and immediately then banged out some very good quality pushups. She quickly transitioned into a plank hold followed by a couple sets of crunches. She chose exercises that she liked and worked for her and of course, her form was excellent. Her workout took approxiametly 10 minutes to complete and she felt physically and emotionally satisfied (and looks great too).
So when divising an exercise regimen, remember to S.E.E. things through for a successful and meaningful program. - Fred Fornicola