Sports injuries
Parachuting at first glance would appear to be an extremely hazardous sport
to be part of, but it has fewer fatality rates, than other sports such as scuba diving, board surfing or ballooning. The main problems which are subject to the control of the jumper are poor estimations of the amount of time jumpers have, to take, to complete maneuvers in the air. Or the poor release of chutes causing impacting which at its best can cause a slipped disc or groin strain to the worst case scenario of fatality. If you have any concerns speak with your teacher and if you still have issues don’t do it.
With the rise of the skateboarder, has developed the rise of injuries related to them more than half of accidents being down to uneven rolling surfaces 
which often involve litigation consultants. Some basic points to remember, to lessen the damage are. If your going to fall off, crouch down on the board so you have a smaller distance to fall. Difficult to do but if you can relax when falling and roll rather than have a heavy impact and be in jeopary of slipping a disc. Use protective gear to help prevent a knock becoming a smash and try to be practical with the chances that you take.
Reynauds syndrome
If you discover that as you are doing any form of exercise you have cold hands and feet it might be useful discovering if you have reynauds syndrome. This can effect in lots of situations but in sport it will have a dramatic effect on performance, for instance if you hammer about on trials bikes the shaking combined with a squeezing action can really bring on this issue. This can often be remedied with the use of connective tissue manipulation to permit the blood to flow correctly the two sites I can think of that deal with this are physio london and the gillingham physio centre.