I go to a self defense class once a week. Last week I sprained my ankle, the instructor ran over, pinched a nerve in my foot, and in seconds it was numb.
Have you ever seen an ice skater or hockey player sprain an ankle or shoulder on the ice? what if a full body suit were made with veins under the rubber and a small supply of air around the waist. It would contain a small CPU (central proccessing unit) that would monitor all shocks, pressures or punctures, it would "nerve numb" it, applie pressure and/or turnique, and notify you of damages.
(the air would be pumped into the veins to tighten the suit)
Reward: Very quick First Aid, and my own suit.