hand extensors

[underdog13]

i am doing open hand in a bucket of sand for my hand extensors and is becoming much easier now. i m wondering what i could do to make it significantly more difficult when i need to.does anyone have suggestions?
thank you

 

[Karky]

first of all, make sure you don't move your hand up while you're opening it, keep it still. You could use your other hand to apply pressure to the surface of the sand, that should make it harder.

 

[dswithers]

You can put a stout rubber band around your fingers. There is a company (Iron Mind?) that makes bands of varying tension for that purpose.