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How to spider curl
Locate the right equipment.
Typically you're going to need access to a gym if you want to do spider curls. Some gyms may have spider curl benches, but if yours does not, you can use a preacher curl bench.
Look for a preacher curl bench that's padded on both sides of the armrest. If you work out at home, you may be able to find a preacher curl or spider curl bench to add to your home gym.