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. No more picking up 17 different sets of dumbbells to give you the results you want! Our JRNY Mobile-Only Membership with Motion Tracking is ideal for strength training at home or on the go; try it free for 2 months from your phone or tablet.