JRNY subscription required* Tone your body during your workouts with the Bowflex SelectTech 1090 dumbbell. Just like all Bowflex SelectTech dumbbells, with just the turn of a dial you can automatically change your resistance from 10 lbs. all the way up to 90 lbs. of weight, so you won't have to pick up 17 different sets of dumbbells to get the results you want.