Lower back pain when running?
Recently taken up HIIT, I do 15 mins of running with 30 secs slow and 30 secs fast (along with appoximately 5 mins warm up and 10 mins warm down). After the about 3 sessions of this my lower back started to ache but i just kept going. Now the previous session it got so bad on one of my later intervals that i had to stop and wlak back slowly. I came across something that suggested the lower back pain comes from sprinting on your toes where the calf is tensed but want to clarify this, and if so can running with heel first still be good way to increase heart rate for HIIT.
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