السلام عليكم ورحمة الله وبركاته، احسن الله اليكم وغفرالله ولاهلك I was using a punching bag in gym the other day with hand coverings to protect my arms, but at the end of my session, there was some damage to the knuckle, not anything dangerous. Is this permissible or considered harming oneself?

Ustadh AbdulAziz al-Haqqan

Allah knows best.