The best way to enact change is to find ways of working something in to everyday life. This is true both for new skills and habits as well as for physical fitness. I have found that squeezing small workouts into any spare minutes helps to improve overall health. This not only keeps you actively exercising, but also taking full advantage of your time.
The trick is to blend these exercises into the things you would normally do every day. This way, it doesn’t feel like you are going out of your way to exercise. This helps you to remember to work out, and also makes it as quick and easy as possible. These exercises use your body weight and minimal, if any, equipment.