endurance, flexibility, strength, balance, 我的理解,这四方面都要有
https://go4life.nia.nih.gov/sites/default/files/newsletter_4_types_exercise.DOC
我自己的routine, 我自己反复调整后摸索出来的
1. Brisk Walk 40-50min at lunch break
2. Running 20-30mim in the evening
3. Yoga 20 min after running
4. Take classes in yoga studio twice a week