This as-told-to essay is based on a conversation with Phil Mackenzie, a 37-year-old fitness ... My granddad does 500 push-ups three times a week, and my nanny walks for two hours every day.
Noelle McKenzie, cofounder of Leading Edge Personal ... as well as how many push-ups they can do in one minute and how far they can run in 12 minutes. Research suggests worse muscle strength ...