This is the one I wear for running and high-impact aerobics. The link is to Champion USA, but a lot of re-sellers have the bra, and they claim to have an Aussie site "coming soon." The bra isn't specifically built for a HRM, but it works well - the band stays below the strap in front, it doesn't pull the contacts out of place, and it creates a little pocket between the breasts where the sending unit tucks in nicely. I do sometimes get a little bit of chafing on the corners of my ribs on longer runs, but never on the bike.
I need lots of support for high impact, but they're not very large. On the bici I wear a cheaper, less supportive version of the same bra - C9 is a brand Champion sells only in Target stores, which I'm not sure if you have those in Australia or if maybe they have another private label for one of your department stores. If not, I'd be happy to send you one to try. For cooler weather I have an Ibex bra, which is wonderfully comfortable and about the same support level as the C9 bras, but doesn't grip the HRM quite as well.



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