What is stretching and why do it?
Stretching means gently lengthening a muscle. It improves flexibility, which is how far a joint can move. Good flexibility helps you run, jump and bend with ease, reduces stiffness, helps posture and lowers the chance of strains. It also feels relaxing. Stretching does not make a muscle stronger. It keeps it long and supple.
Types of stretching
- Static stretching: pull to mild tension and hold still for 20 to 30 seconds. Best after exercise, and on its own to gain flexibility.
- Dynamic stretching: slow controlled movements such as arm circles or leg swings. Best as part of a warm-up.
- Ballistic stretching: bouncing at the end. It is risky, so avoid it.
Rules for safe stretching
- Warm up first for 5 to 10 minutes (walk, jog on the spot). A warm muscle is stretchy; a cold one tears.
- Pull slowly until you feel mild tension. Pain means you went too far, so ease off.
- Hold 20 to 30 seconds and breathe slowly. Do 2 to 4 rounds for each muscle.
- Never bounce and keep your knees and back in a safe line.
- Stretch both sides equally and do it regularly, 3 to 5 days a week.
Shaping: what it is
Shaping (shape-up or body-toning training) is a set of rhythmic exercises, often to music, that work the main muscle groups one after another: arms, shoulders, chest, back, tummy, hips and legs. It aims to tone and firm the muscles, improve posture and body shape, and burn energy. It is not only for looks: strong muscles protect joints and the spine.
Reps, sets and rest in shaping
A repetition (rep) is one full movement, such as one curl. A set is a group of reps, for example 12 reps. Beginners do 2 or 3 sets with a short rest between them (30 to 60 seconds). Use a light weight, or your own body weight, and move slowly, up in 2 counts and down in 2 counts. Train each muscle group 2 or 3 days a week with rest days between, because muscles grow back stronger while you rest. Finish with a cool-down and a few stretches.
Try it
In the 3D: first slide the stretch to 55 and hold. Watch the timer climb to 30 s. Then push the slider past 80 and see the colour turn red. Now switch warm-up off and see the muscle turn blue. At home: march on the spot for 3 minutes, then hold a calf or thigh stretch for 20 seconds, counting slowly. Next do 10 slow arm curls with a water bottle, rest, then do a second set.
Key formulas and definitions
- Static stretch: 20–30 s hold, 2–4 rounds, mild tension, no pain
- Order of a session: warm-up → main work → cool-down and stretch
- Shaping: reps × sets (for example 12 reps × 3 sets), rest 30–60 s
- Train a muscle group 2–3 days a week with rest in between
Worked examples
1. Meena does a thigh stretch for 25 seconds, 3 times on each leg. For how many seconds in total is she holding the stretch?
Per leg 25 × 3 = 75 s. Two legs: 75 × 2 = 150 s, which is 2 minutes 30 seconds.
2. A student does 3 sets of 12 curls. How many curls is that in all?
12 × 3 = 36 curls.
3. Ravi feels sharp pain while stretching. What should he do?
Stop pulling and ease off until only mild tension remains. Sharp pain means the muscle is overstretched and can be injured.
4. Which kind of stretching is best before a game, and which after?
Dynamic stretching (arm circles, leg swings) as part of the warm-up before the game, and static holds after the game while the muscles are warm.
Common mistakes
- Stretching a cold muscle without a warm-up.
- Bouncing at the end of the stretch. It makes the muscle tighten and can tear it.
- Holding the breath. Breathe slowly and the muscle relaxes.
- Training the same muscle group every day with no rest, which prevents it from recovering and growing.