Jessica Biel works out and she works out hard but it definitely pays off.
Want to hit the track to start training for your title as sexiest woman alive but have no idea what to do then, read more
Go to a track and run a lap (400m) at a high intensity for your skill level -- say 2 minutes for one lap. Then rest for 90 seconds and go at it again.
This time, try to keep the same time (2 minutes or better) for your sprint, but use more intensity. Repeat 8 times (about 1.5 miles). Each time you go around try and keep the same time or better (as your original lap) but increase the intensity.
Be sure to warm up before you start running and to stretch after. If you don't typically run (or do any kind of cardio training) you may want to start with longer distances (at a slow pace) for a few weeks rather than jumping right into sprint training.
Fit's Tip: Scope out a local track for when it is open to the public. Also, some gyms have indoor tracks as well but a lap may be a shorter distance so go around twice or do more reps. Running on the track is a great way to switch up your workout.