I have a short torso, too. I wear it under the bottom band of my sports bra, too. It takes some work to get the right length because as you sweat it tends to stretch a little bit. Some bands ( like the one from Polar H10) are much better than others. The Garmin strap don’t work well for me. Initially I felt a little claustrophobic but I got used to it. This Polar H10 is the best and most flexible and comfortable in my opinion. I think it depends on how tight is your bra, too. I used to wear one during HIIT sessions with a really tight bra and by the end of the session I could not wait to take it off. lately I have been using a more relaxed bra and it doesn’t feel as constricting with the HR strap.