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I was really concerned that people weren't really understanding that there are consequences for sprinting on too big of an incline all the time, so after a lot of research and really digging into what happens to the body on an incline, we created the 5 percent incline guideline-- we don’t do any maximum sprinting over a 5 percent incline so that you aren’t putting too much pressure on your lower back. We just recalculated the work load so it feels better.