You back probably does not like the flexion. You should do what pity says. He will explain it further I'm sure if you want.

The statics will help build up the lower back muscular endurance...which is what you want.

If you tweak your back doing extensions then you damn sure shouldn't be doing goodmornings until you learn to do them from the hips.

e

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.