Celebrity trainer Donovan Green gives some great advice on how to get fit for free. you do not have to spend a lot of money on a treadmill you can get a great workout right in the park for free.Donovan Green is a certified Personal Trainer, Martial Arts instructor, Owner Of 6 Elements of Fitness Gym, Fitness Expert, Trainer & Friend to Dr.Mehmet Oz, Health Counselor, Fitness coordinator for Health corps, and Fitness Coach to many.