Hi everyone. The YMCA 3-minute step test requires a 12-inch-high step. I was wondering how strictly this needs to be enforced. I was looking for a 12-inch-step, as well as considering building one (I’ve got woodworking experience and thought I’d just emulate one of those plyo boxes), when I thought about this portable step stool sold in a hardware store. It’s rated for 350 pounds, but it’s 13-5/8 inches high. Any thoughts?