Because with one arm you can rotate in to a more powerful position?
In addition to the more powerful position (getting more “under” the grip with a more inward rotated arm position), there seems to be some consensus that a uni-lateral load has some neurological advantages over a bi-lateral one and thus you would be able to pull harder.
I think this is why IIRC Tommy/Lattice said on one Podcast that they recommend uni-lateral Max Hangs for really advanced and otherwise maxed-out athletes, as it allows them to create some higher load and thus extra stimulus.
And referring to habrich’s point above on the relationship btw 2-arm and 1-arm max hanging finger strength scores, I assume that Lattice would also have some side-by-side benchmarks on how these compare to each other, as their regular test protocol is 1-armed, vs. their test protocol coming along for free with the test rung (as in the “my fingers” space on their site) seems to be 2-handed.
Anybody got any experience with that / could share their own values of how 2-handed is comparing to 1-handed?
For me it is (not tested on an original Lattice rung, but on well rounded 20mm edge from the wooden Rokodromo hangboard), half crimp @68kg BW
# 1-arm ( 5 secs): - 7 kg, so 61kg absolute load (for stronger arm, but with both arms being roughly at same level, within 1-2 kgs)
# 2 arm (5 secs): + 36 kgs, so 104 kg total load
=> Which makes my 2 arm load only 1,7 times the 1-arm load (104/61), as opposed to habrich’s roughly 1,6 factor (95/60 ).
Anybody has got any further reference values for this?