Wrist flexibility

Hi guys- I'm getting a bit concerned about the lack of flexibility in my wrists (I'm having trouble doing conventional pushups owing to the angle my wrist is at), i do work a desk job so I'm expecting some loss of performance but given that I'm only 19 I'd like to retain full flexibility for as long as i can.
I'm already doing a fair amount of stretching to try and alleviate the problem but I'm just curious if there is anything else i should be doing.