Which term describes the rate of running that involves repetitions of hard uphill efforts?

The term that describes the rate of running that involves repetitions of hard uphill efforts is "Hill Repeats." This type of training focuses on running uphill at a high intensity, followed by recovery periods. Hill repeats are effective for building strength, improving speed, and enhancing cardiovascular fitness. By incorporating repeated efforts on an incline, runners can develop power in their legs and improve their overall running efficiency.

The other terms refer to different training methods: a recovery run is typically a slower, easier run designed to promote recovery; fartlek involves varied pace running that can include both slow and fast segments, often over flat terrain; and a progression run gradually increases pace over the duration of the run, usually finishing faster than it started. Each of these terms describes distinct training approaches that serve different purposes in a runner's regimen.