On warfarin, I've played volleyball, run, biked, skied, waterskiied, jet skied, motorcycled, (on and off road), played soccer, skated, sailed, and worked with machinery that bumps bangs and cuts me daily. I've travelled, worked and played in something like 20 countries on three continents. Now I work in Special Effects and get knocked, sliced, abraded, hung, and the other day, shot three times in the chest. (It was fake, as a camera test, but it was explosives, and I sure felt it.)
After nearly 6 years with my valve, with warfarin, and with a knitted sternum, I can say it hasn't slowed me down much. You needn't let it slow you either! Just try not to get hit in the head too hard. (Which is good advice for anyone.)