Self-inflicted?Everything. Going up and down stairs, planks, stretches, pull ups, crunches, bicycle crunches, air pedaling, wall pull ups, wall hangs, pretty much everything but push-ups.
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Self-inflicted?Everything. Going up and down stairs, planks, stretches, pull ups, crunches, bicycle crunches, air pedaling, wall pull ups, wall hangs, pretty much everything but push-ups.