Hill repeats are designed to develop strength and durability in your running. These repeats will vary from 90 seconds to 10 minutes depending on the work out. The variation in intensity and duration creates an environment for greater adaptations and strength. We first run the trails for 45 to 60 minutes before going into our repeats. It is very important to be warmed up to get the most out of the work out and avoid injury. Make sure you are staying well hydrated throughout the running season. Bring some water as dehydration is a leading cause of pulled or strained tendons.