So i did planks for first time today. 4 sets 1 min. First 2 sets were ok. But last 2 sets after 30 seconds my shoulders would feel the burn a lot an start to shake. Normal? Should i reduce to 45 seconds or keep at it?
^^ As do I. Go until your hips start to sag toward the floor. Once this happens, your core is fatigued and sagging your hips wont do anything for core strength
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