What is the best way to do the sprints? Can I use a bike?
ASure you can use a bike or any other piece of equipment that you like, just be sure that you can increase the tension or slope so you can make the sprint interval hard enough. I would also recommend switching machines or activities frequently to avoid boredom and to keep the body guessing. Most of my clients prefer running on grass, doing flights of stairs and jump roping since these activities can be done just about anywhere. Similar questions to the one above home come in very frequently. For those using a treadmill, try raising the ramp for the sprint portion and doing the active rest at the flat level point. This enables you to increase the challenge for the sprint without having to change the speed for each portion of the interval.
