If you're in good shape, give this a try! It consists of 7 exercises repeated 200 times each, so 1,400 reps total. Dr. Brown's time on March 16, 2016 -- his 61st birthday -- was 23:24. Give it a try -- and do it in the order stated on the video, not going to the next exercise until each set of 200 reps is completed. Rest as needed! (Note also that Dr. Brown follows a totally healthy eating lifestyle, which is the biggest key to his fitness.)