I have been slightly varying my hand placement the whole time, so I didn't expect to notice anything from switching to knuckles.

I alternate. Sometimes I do them on my knuckles. Some times I do them declined. Gotta keep it fresh. 

grayruby

I switched to knuckle pushups last month, because they're easier on my wrists. It was interesting how even that slight of a change had a noticeable impact on the difficulty of the workout. 

Undisciplined

Stacker Saloon

saloon

Howdy!

127 days of 100 push ups a day until $100k down. Undetermined to go. 
123 days of 100 squats a day until $100k down. Undetermined to go. 