How ‘Sprint Interval Training’ Compares to HIIT (and How to Do It)
Sprint interval training, or SIT, is super trendy right now. It’s a great way to improve your running speed and to get in a hard interval workout, and I’ll explain…
Sprint interval training, or SIT, is super trendy right now. It’s a great way to improve your running speed and to get in a hard interval workout, and I’ll explain…