I like using the treadmill for interval work. Depending on the machine you can preset times and setting, this allows you to regulate your work out and get the best from the treadmill. Interval trainning will help you with your stamina and also decrease your run times. I like to warm up for 10 minutes, then for 2-3 minutes run at 80% max speed, then cool down for 1-2 minutes. Do that 4-6 times and then for the next ten minutes do the same but increase the incline to 10, and walk at a force march speed concentrating on extending your legs. Then lastly run at normal speed for 5 minutes and then cool down. I hope this helps, it also the best way to loose weight.