Which exercise is better: Running or? Please need help quick!?

Ughh I haven’t been on the treadmill in like a month already! I’m afraid to get back on if it makes sense haha. I also have been doing the Jillian Michaels Frontside, Backside and Cardio Kickbox DVD’s for the past two weeks alternating them each day. On top of that I have 3 hr dance practices in the morning and we run, do pushups and situps, also a floor workout with lunges etc. I’m wondering what would be a better option to do tonight? I really want to get faster in my running cause I have to build up my speed but which do you think would help me more today? Running on the treadmill for probably 20 minutes or doing the Jillian Michaels “Frontside” workout dvd? This is it:

it depends on how hard of a run you do on the treadmill. if you really push yourself, i think that would be more worthwhile because it builds up endurance and will help you on your 3 lap run an example of a good workout would be running comfortably fast and then doing 1 minute sprint intervals. it helps your endurance a *lot*!
if you were just planning on going for a light jog on the treadmill then the dvd would be the better bet.

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