Uphill sprinting builds muscular endurance and muscle strength because the major muscles of the body must work harder to propel your body up a hill. The slope of a hill targets the glutes, hamstrings, quadriceps, calves, core and upper body and, similar to weight training, allows you to build more muscle
To Crush a Hilly Course:
Do it: Warm up for 2 to 3 easy miles, then do 6 to 8 hill repeats at an effort of 7 out of 10. Jog downhill for the recovery. Take 1 mile easy (more advanced runners can skip this step) then run 1 to 3 miles at goal race pace before a 1- mile cooldown
Jog for 5 to 10 minutes on a flat surface to warm up. Once you feel warm, run up the hill at an easy and sustainable pace for 10 to 20 seconds, then walk back to the starting point. Run up again the hill, then walk down. Repeat the sequence for 15 to 20 minutes—or for as long as you feel strong.