The 5 Tibetan Rites - This would be an excellent exercise to introduce to your students.
Simple Ancient Techniques for Youthfulness and Vitality The Five Tibetans, or the Five Rites of Rejuvenation, is a system of Yogic exercises said to be over 2500 years old. You flow through the five exercises almost in a meditative dance. Each exercise stimulates a particular chakra or hormonal system and revitalises certain organs, so that the five rites together form a complete workout for the body as a whole.
Five simple techniques, and 20 minutes a day, is all it takes for a youthful, energetic you. Watch and learn the practice here.