In high school I showed promise as a sprinter but I never pursued it. I don’t even remember my time and I only had one officially timed race where I got a very bad start then started gaining on everyone but finished in the middle of the pack. I was better than that. I’m about 40 pounds heavier (a bit overweight) and 20-something years older now. Arm strength is about the same just from chores and genes (I can barely curl a 50lb dumbbell once). I’ve had plantar fasciitis in my left foot for about 10 months. It still hurts for a few minutes when I wake up the day after I walk about 4-5 miles or when I walk 2-3 miles two days in a row. I rarely run fast for anything but I’ve been walking a few miles about twice a week for exercise. When I do run semi-fast, it still feels right, so I want to time myself in the 100 meters.
So, lets say I walk 1/2 mile, stretch, then try running 100 meters as fast as I can. Can a 42 year old in my condition survive that without injury? Any predictions on how fast I’ll be?