Circuit training is used to develop your general strength and stamina. It consists of a course which you either walk or run around, stopping at various points to do a series of exercises. A typical circuit you could try is shown below. You could do it in a park or field, or indoors in a hall or gym.

Press-ups

Lie face down with your hands beneath your shoulders. Keeping your back straight, push with your hands to raise your body. Lower your body almost to the ground, then repeat.

Sit-ups

Lie on your back with your knees bent and your hands held on your shoulders. Slowly lift your upper body until your elbows touch your knees. Then lower your body again. It may help if someone holds your feet.

Step-ups

Step up on to a low bench or stair and down again. Alternate which leg you lead with, and straighten the leg you step on to before stepping down.

Squat thrusts

Crouch on all fours with your hands on the ground, shoulder-width apart. Without moving your hands, jump your feet backwards to extend your legs and forwards to bring your knees up to your elbows.

Back raise

Lie on your front, with your hands clasped behind your head. Slowly arch your back to raise your head and upper body from the floor. Then lower your body again. It may help if someone holds your legs down.

Dips

Position yourself as shown in the diagram, supporting yourself on a chair or bench. Keeping your body straight, bend and straighten your arms to lower and raise your body.

Do each of the exercises for 30 seconds, followed by a 30 second recovery period. Use the recovery time to walk to the next exercise. As you get fitter, you could run between exercises to make the circuit more difficult.

When you have completed the circuit, rest for five minutes before continuing. Start with three complete circuits and build up to six as you get fitter.