my gf is looking to get a heart rate monitor for using during her gym sessions. she doesn't want one with a chest strap though, because she's rather well-endowed and even if she found one that would fit, it would most likely be very uncomfortable. and just to pre-empt the obvious, i won't be providing any photographic evidence...
so, yeah- not too expensive HRM without a chest strap, that works reasonably well/accurately. what are her options?

