one approach to planks is simply by time. Start with 3 sets of 30 seconds, with 15 seconds rest between each set. Increase the plank time over the weeks. When you get to 5 minutes per set of plank you'll want to be reading books or something. :)
one approach to planks is simply by time. Start with 3 sets of 30 seconds, with 15 seconds rest between each set. Increase the plank time over the weeks. When you get to 5 minutes per set of plank you'll want to be reading books or something. :)
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