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A Missouri man completed 6,050 knuckle pushups in his quest to claim the Guinness World Record for doing the most knuckle pushups in 12 hours

What makes it an even more remarkable achievement is that just 17 years ago, the elementary school teacher couldn't even lift a gallon of milk

After being diagnosed and treated for osteoporosis, spondyloarthritis and hypogonadism Welch tells PEOPLE he felt that he had been given a second chance at life

Every morning, Missouri elementary school teacher Kim Welch, 37, starts his day by going to the gym, alternating between upper body and leg exercises, sometimes throwing in elliptical workouts.

Later in the evening, he typically runs for more than an hour and has a habit of sprinkling in calisthenic training throughout the day — and e

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