I use my Custom-1s for this and they do fine. Isolation is good if you don't want to hear the machines and I don't have to turn it up anymore than normal. The cord has a cinch on it so you can pull it tight. This cuts out microphonics and means you don't have to worry about it swaying around. Haven't noticed any problems with sweating, and they seem durable enough, just be careful and they should last. I like them for workouts (and my other IEM needs).
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