I am a woman beyond 40 and I would have kicked my 20 year old selfs ass. I have been a daily runner (1okm) since 23 and yoga/pilates but 5 years ago I started krav maga training and eating more protein ( I started eating meat ) and my speed increased by 2 miles/hour and I can do 20 marine push ups in 20 seconds and pull ups. I feel really great. I also got rid of my chronic back pain by this muscle-building method (from scoliosis) coupled with stretching (yin stuff plus my own variations). Experts I visited were useless; and women I meet of all ages tell me "i'm just lucky/special" so this study spreading around I hope inspires people because it's hard to go on walks with my peers because they need to stop for rests. What will happen when I'm 20 years older?