I chose these specifically because people (online) said the 1.5" ones were better if you want an aerobic workout, and the 2" ones were better for increased strength. So. I went with the 2", since I wanted to increase the strength of my forearms, and had no interest in aerobic benefits (I play sports and get plenty of that already).Having said that, these are heavy! We use them within a Tabata protocol, and with the exercise duration (of each segment) being 20 seconds. When we first got these, we couldn't do any significant movement for more than 10 seconds. If you are a pretty strong athlete, the 2" still may be for you. If you are a normal human being who wants aerobic benefits - and wants the exercise duration to be longer - get the 1.5" versions.
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