> Professor Nosaka recommends using two hands to help with the concentric (lifting weight) phase, before using one arm for the eccentric phase (lowering weight)

> Professor Nosaka recommends using two hands to help with the concentric (lifting weight) phase, before using one arm for the eccentric phase (lowering weight) Technically, that's not doing 'half as many reps', as the article claimed, it'll take you exactly the same amount of reps. If you care about minimizing time rather than reps, that's even going to take you (roughly) twice as long compared to using two dumbbells at once.