Surya Namaskar is the easiest form of exercise. It is the complete exercise which helps you to breathe out and discharge poisons which inhibit life. You could also cycle, swim, skip, jog or play rugged games like tennis, football or hockey, participate in aerobics, dancercises, etc. They stunt your growth, make you slow and reduce your life span. Fast once a week to give rest to your vital organs.
All internal organs are vital organs.
They work incessantly. Many a time you overload them beyond their capacity by various excesses. Fasting will help them rest and recuperate. No milk, no tea, no coffee, no liquor, no aerated waters are permitted during fasting. For, too much of a tasty toast brings out tummy and troubles.