Exercise: classification, strengthening exercises, health benefits and yoga
Exercise is planned, structured and repeated activity done to improve fitness. It is classed by energy system, contraction type and purpose; yoga adds flexibility, balance and calm.
Classification of exercise
| Basis | Types | Examples |
|---|---|---|
| Energy system | Aerobic (uses oxygen, long and steady); anaerobic (short, very hard) | Brisk walking, jogging, swimming; 100 m sprint, weightlifting, jumps |
| Muscle action | Isotonic: concentric (muscle shortens) and eccentric (muscle lengthens under load); isometric (no change in length); isokinetic (constant speed on a machine) | Biceps curl up and down; plank, wall sit; isokinetic dynamometer in a sports lab |
| Purpose | Endurance (cardio), strength (resistance), flexibility (stretching), balance (neuromotor) | Cycling; squats; static and dynamic stretches; yoga balance poses |
| Pattern | Continuous or intermittent (interval) | Steady 5 km run; HIIT, hockey, kabaddi |
| Intensity | Light, moderate, vigorous | Stretching; brisk walking; running |
Specific exercises for strengthening
| Muscle group | Exercise | No-equipment or low-cost version |
|---|---|---|
| Thighs and hips (quadriceps, glutes) | Squats, lunges, step-ups | Body-weight squats; step-ups on a stair |
| Chest, shoulders, triceps | Push-ups, bench press, overhead press | Knee push-ups; filled water bottles as weights |
| Back and biceps | Rows, pull-ups | Resistance-band rows; towel rows against a door |
| Core (abdomen, lower back) | Plank, side plank, bridges | All use body weight only |
| Calves | Calf raises | Raises on the edge of a step |
| Grip and forearms | Handgrip work | Squeezing a soft ball |
Principles of strength training
- Overload and progression: add load, repetitions or sets slowly so muscles keep adapting.
- Specificity: train the muscles and movements the sport uses (leg power for kabaddi, shoulders for bowlers).
- Recovery: about 48 hours before working the same muscle group hard again.
- Reversibility: gains are lost when training stops.
- Technique and breathing: warm up first, use correct form, breathe out while lifting; do not hold the breath.
- Dose (ACSM): each major muscle group 2-3 days a week, 8-12 repetitions per set.
Health benefits of exercise
- Stronger heart: lower resting heart rate and blood pressure; better HDL cholesterol.
- Better insulin sensitivity and blood glucose control.
- Less body fat and more muscle; easier weight control.
- Higher bone density, especially from weight-bearing and strength work.
- Better posture, balance and joint mobility; fewer falls in old age.
- Better mood, sleep and stress control.
- Lower risk of obesity, type 2 diabetes, heart disease and some cancers.
Yoga and its benefits
| Practice | Examples | Benefits |
|---|---|---|
| Asanas (postures) | Surya namaskar, tadasana, vrikshasana, bhujangasana, paschimottanasana | Flexibility, balance, muscle strength and endurance, posture |
| Pranayama (breath control) | Anulom vilom, bhramari, ujjayi | Better breathing control and lung use, calmer mind, lower heart rate |
| Dhyana and relaxation | Meditation, shavasana | Less stress and anxiety, better sleep and focus |
| For athletes | Short sessions after training or on rest days | Recovery, mobility, fewer injuries, concentration for shooters, archers and batters |
Strength work builds muscle only when energy and protein are enough: a young cricketer doing squats and push-ups three days a week needs protein spread across meals (dal, curd, egg, paneer). Yoga is best practised on an empty or light stomach, so plan it before meals.
2 marks: “Differentiate isotonic and isometric exercise.” Isotonic: the muscle changes length and moves a joint (squat, biceps curl). Isometric: the muscle contracts without changing length (plank, wall sit).
5 marks: “Write the benefits of yoga.” Asanas for flexibility, balance and strength; pranayama for breathing and calm; meditation for stress and sleep; uses for athletes; one example each.
10 marks: “Classify exercise. Add a note on exercises for strengthening and the health benefits of exercise.” Classification by energy system, muscle action, purpose, pattern and intensity; strengthening exercises by muscle group and training principles; benefits by body system; yoga.
FITT tells you how to train: Frequency, Intensity, Time, Type.