cheap sports bra from Target (mine was less than $10, not on sale) or use one you have already. I like these because I'm flat-chested, but any sports bra will do. You'll also need a spare heart rate monitor strap that works with your monitor (or if you have a throw-caution-to-the-wind mentality, use the original strap). I use a Garmin monitor, and replacement straps that work with both Garmin and Polar monitors (check to be sure before buying) are available on Amazon for $12.50. You'll also need some hook and loop (Velcro). I found an "soft and flexible" variety at Joann's, which works perfectly for this application and I would highly recommend. The super soft loop side, which will go on the bra toward your skin, is good for when you don't want to wear the monitor
Next, identify the points on the monitor that make contact with your skin. You do not want to cut these, so trim the strap about 1" away from these contact pads to reduce the length of the strap to just the important part.
|I zigzag sewed the edge of the strap because it was fraying a bit. |
Caution: you will NOT attach the Velcro to this side!
This is super important: flip over the strap so the contact pads are face down. You want to attach the hook side of the Velcro to the side of the strap that faces your bra (the side with the snaps for the monitor). Cut a piece about 1" long and zig zag sew the Velcro to the strap, being careful not to sew over the contact pads. I actually have no idea what would happen if you did, but I'm guessing there's electrical stuff in there that might get ruined. Sew the Velcro to the other side in the same way.
|Before sewing. Note the attachment snaps for reference.|