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. Keep working out with JRNY wherever you go from your phone or tablet; try the Mobile-Only Membership free for 2 months.*JRNY subscription required. JRNY subscription auto renews annually at then-current annual rates, plus applicable taxes, unless canceled at least 48 hours before free period ends.