<p>Garmin 305 for anything outside. I also have a Polar FT4 for indoor use. However, my Polar can get way off sometimes. I have looked down while teaching a spin class and my monitor is frozen on 220 bmp. I know I am working hard...but no way. Once I adjust the strap my HR drops. I am thinking the FT7 would have been a better investment for trainer workouts, etc.</p>