i havn't done a crunch in awhile, but I get bored of them easily anyway and they kill my back. are there some good core workouts on youtube? any recommends for a distance runner?
Abs - stability ball work well? as I age (30's) crunches are taking a toll on my back, so i stopped - there has to be SOMETHING that will target the abs better with less stress on the back.
thank you
man up, you're in your 30's, you're not that old
planks
planks are the same as boards.. correct?
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