Lately at the gym, I keep seeing groups of 2 hot girls working out together. Today for example, the 2 I saw were even taking pictures and video of each other doing squats in yoga pants, presumably to put on facebook to get validation from their respective beta orbiters. As a man who wants to actually f*** them, what is the best way to go about this approach?

If it was one girl by herself, I already have a game plan for that: ask to work in on whatever machine she is using and start asking questions about the exercises mixed with light humor. But I don't see a clear opening in this case, especially when they are both taking turns on a machine together, stretching on the mats together or in the squat rack.