!YouTube - 400 meter Sprint and Walk Cardio Program. About 60 to 70 secs Sprints (13.5/14 mph) by Tuan Tran
youtube.com/watch?v=0tMwErDzTgw&feature=channel
YouTube - 400 meter Sprint and Walk Cardio Program. About 60 to 70 secs Sprints (13.5/14 mph) by Tuan Tran
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