I've never have been a big fan of weight vest I always thought that they would put a little to much strain on your knees. But back in highschool I was a distance runner, and once for fun I tried running a few miles with 20 lbs on I thought I was going to die, so I can only imagine what 60 lbs would do. But that was distance say 2-3 miles. Not sprints so I don't know,