Go running and tell your self your not going to stop. Make a list of strength things you know you can do. I would also talk to a trainer for ideas. Numbers go until it hurts then add 10 more or until you can't do it at all any more.
It's best to start with Cardio (Running, etc.), then move on to strength. This is what I did; it will get you better results faster, because it will help build overall strength and breathing first. But, as far as a detailed "plan", I prefer to create my own, but a fitness "game" would be a great alternative to this... :)
This depends on a number of things, including your objectives (are you trying to lose weight, strengthen, gain stamina?), and your current physical state. For a person trying to improve general fitness, a mix of cardio (walking, running, cycling, or swimming), load bearing exercises (weights, pushups, etc), and stretching (yoga, some calisthenics) would be a good approach.
If you are currently out of shape, you might try brisk walking, a few exercises with dumbbells of light weight (but heavy enough that you can work the muscles to the "failure point" where you can't do more than fifteen or twenty repetitions), stretching, and some stamina-increasing exercise (twenty minutes of hilly terrain on a bicycle twice a week would be an example).
Start slow, and alternate days between the different sorts of exercise. Emphasise consistency rather than intensity.
Of course exercise is like diet. People are partisan for this or that program, and often claim miraculous results. The main points to keep in mind are do it consistently, don't overdo it, and cover all the major bases (cardio-vascular, strength, stamina, and flexibility).
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