According to your age, you have different choices. Generally young people choose running, and Baduanjin, while old people choose Tai Ji Chuan. But as a lifelong exercise, I suggest you run. Tai Chi is too slow and Ba Duan Jin is too fast. Running is best for lifelong exercise. You can jog every day, eat more vegetables and drink more water. I believe you will have a good figure, and it won't last more than three months! I hope everyone can adopt the suggestions, thank you!