One group lifted
heavier weights (up to 90 % 1 - rep max weight), performing sets of 8 to 12 reps.. The other group lifted lighter weights (no more
than 50 % 1 - rep max weight), performing sets of 20 to 25 reps. Throughout the training protocol, the researchers took
regular measurements of muscle fiber size, muscle mass, and blood samples.
Weighing 188g, it's 11 percent
heavier than the original U11, which was just comfortable enough to be used like a
regular phone with
one hand.