Planks are a great way to develop ab muscles without compromising your spine health. Most people simply stick with basic plank exercises, but there are quite a few variations to keep the workout challenging.
Found decent 7 exercise circuit.
Traditional plank
Up and down plank
Hop in hop out plank
Plank with knee drop
Plank with knee drive
Push up to plank hold
Side plank
Link: Saturday Morning Drill: 7 Planks to a Stronger Core
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