Hi. My partner and I are currently considering purchasing the TOMTOM SPARK CARDIO + MUSIC fitness watch. The issue, however, is one of size, both of us having fairly slender wrists. Having tried on the 'Large' model, it is clearly too large and cumbersome. Unfortunately, we were unable to sample the 'Small' model. Is the actual watch face/body of the 'Small' model physically smaller, or does this just pertain to the watch strap? Many thanks in advance of all your assistance.