In reply to Cake:
To be sort-of scientific about it we can look at the view of the BMC's insurers, who have a huge history of claims to look at (but remember they are looking at cost of injury not severity). If you have BMC travel insurance no sports are allowed with the exception of
Aerobics, Angling, Archery, Badminton, Ballooning: hot air (passenger only), Banana boating, Bar work, Baseball, Basketball, Beach games, Billiards, Bird watching, Bodyboarding, Bowling, Bowls, Bridge, Camel trekking, Chess, Cricket, Croquet, Cycling , except cycle touring, cycle racing, BMX and/or mountain biking), Dancing, Darts, Dinghy , ailing (on-competitive and on inland or coastal waters only), Elephant riding/trekking (UK , ooked), Football: beach kick-around, Freshwater/sea fishing, Frisbee, Fruit or vegetable , icking, Glass-bottom boats, Golf, Historical research, Indoor skating, Jogging, Keep fit, Motorcycling on public roads (tarmac/concrete) with appropriate UK licence and no racing , inc. as a passenger) up to 125cc, Netball, Pilates, Pony trekking, Pool, Quoits, Racquetball, Re-enactment, Restaurant work, Ringos, Rounders, Safari (UK organised – no guns), Sail boarding, Snooker, Snorkelling, Softball, Squash (amateur), Surfing (amateur), Swimming , amateur), Table tennis, Ten-pin bowling, Tug-of-war, Volleyball, Wakeboarding (amateur), Water Skiing (amateur), Whale watching, Windsurfing, Working (non-manual work e.g. , ffice or attending a conference), Yoga.
If you buy trekking insurance you are also covered for
Backpacking, Camping, Canoeing and kayaking (inland waters up to and including Grade 3), Cycle touring, Dragonboat racing, Fell walking, Fencing, Glacier walking, Gorilla trekking, Hill walking, Horse Riding (excluding racing & jumps), Horse Trekking, Mountain walking, Paintballing (professionally organised), Rambling, Rock scrambling (ungraded), Rowing, Safari (non-UK organised), Sea kayaking (coastal waters up to 12 miles offshore), Snorkelling, Snowshoeing, Surfing (competitive), Swim Trekking, Swimming (competitive), Sydney Harbour Bridge, Trekking, Via ferrata, Wake Boarding (competitive), Water polo, Water Skiing (competitive), Winter mountain walking.