Chest Press.

The arms meet. The load is not shared.

A bar forces the hands to follow the same path straight up, and the chest never gets to do what it is really made for: bring the arms in towards the middle. Here the levers converge inwards towards the end of the press, and each arm has its own plate load, so the strong side cannot smuggle the weak one through the set. You load with Olympic plates (Ø50 mm) on pegs at both ends and feel in the first rep whether the two sides are equal. The frame weighs 200 kg empty, takes 1770 × 1450 mm of floor and is 1935 mm high. The weak arm has nowhere to hide.