Hi Dear !! Thanks for your query to HCM .
Read and reviewed your query and health concerns.
IN the given situation, You should avoid and refrain from going for paintballing at week end.
This game may precipitate your sensitive clotting mechanism, from paintballing game.
Paintballing game-involves, risks of contusion
injuries and chance of traumatic leg injuries
, which may expose you to DVT or VTE(Venous Thrombo-emoblism).
So listen to your friend's advise,as he is correct.
Hope this would help you to plan further of this complex illness of yours.
If need be, update any health issue 24 x 7 by a direct question to ME, at following HCM link-http://doctor.healthcaremagic.com/Funnel?page=askDoctorDirectly&docId=70229
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You are most Welcome herewith !!
Wishing Good Healthy Life in time to come!!
Senior Surgical Specialist