These will get your heart rate up and with the correct combination of movements can really become impossible during a circuit.
The point is to get a little opposition in for your arms. All we (as climbers) normally work on is compression and this will work to complement those climbing muscles and help prevent injury.
Similar movements like this with the rubber band will help strengthen you up for those shouldery boulder problems and routes.
Get outside and have an adventure!
piz : )
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