HOW TF DO I BONESMASH WITHOUT GETTING GREEN BRUISES

[kingkyerna]

i wanna bs but my parents know abt it and they know that i do it when theres green bruises. i see people do it while only getting red bruises and it going while the swelling stays. so if u know how please tell me:

 

[wecouldbelegendary]

Dont hit as hard as you do now and do it for longer