9 Terrible Treadmill Mistakes that Make Trainers Cringe

Not warming up

Most personal trainers and group fitness instructors will tell you the most important part of class or a workout session is the warm-up. Yes, even your super-fit spin instructor will likely explain that a quality warm-up will loosen up your body, prevent injury and discomfort, and set the tone for your workout. Since runners are notorious for skipping warm-ups, there are apps to remind you to warm up before you run. (Try i.Run) And, yes, a cool-down is just as important.