15x50M*
*From mailbox at 44 to 42.
Hill sprints might be the one exercise to rule all others. 10-20 reps of hill sprints over 50-70 yards, 3-4x a week will change your life. And in a very short amount of time”. - Jason Helmes
AVG HR - 125 BPM
MAX HR - 156 BPM
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