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Between The Mid Muffin and The Lower Muffin is a 15' boulder with problems on the two aretes facing mid muffin. The right one (facing the boulder) is Gym Rat. Start on the undercling as low and right as you can, traverse left around the arete then up to a slopey hueco and the finish mantle. The crux move is very powerful.
There's a medium sized rock jetting out of the ground right beneath the landing, so a crash pad is vital to working the problem.