For exercise, including C2, you want the UM2's. I've erged several millions meters with them and they are great. excellent isolation, particularly with shure olives or modded biflanges. they get loud, they have great bass, and they sound great with rock, which is what i listen to on the C2. i had the sa6 and returned them- didn't get loud enough without an amp and anemic bass, even with a good seal.
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