I'm no Dolly Parton, but I still didn't expect these little bras to support me very well while riding my horses, but I'm pleased to say that they do.  I also hike three miles every morning and, although going bra-less for decades never bothered me, I now get annoyed at The Girls' slightest jiggle against my t-shirt.  Problem solved with this simple little bra.  It's so comfortable, I can forget I'm wearing it which is rare for this old, bra-burning, 70's hippie!