In many intense training programs this kind of workout are included which will not take more than 15 minutes. In a very short time it can get you into shape and all you need to do is get the technique right.
Here are some workout for which even a busiest person can find time for such a set.
1. Before beginning your training, do a 5-minute warm-up: some squats, arm and leg swings, body rotations and bends, as well as neck and knee warm-ups.
2. Set a timer for 15 minutes. Do all the exercises one after another, only stopping to rest if you really need it. Repeat the set as many times as you can manage in 15 minutes.
3. Repeat the training set every two days, and try to increase the number of reps.
4. Raise the time of the training to 20 minutes after 3 weeks.
Set your legs wide apart with your toes outward. Pull your hips back a bit, and squat until your knees are bent at a right angle. Strain your buttocks, jump straight up, and land softly. Repeat 12 times.