This is because covering two joints that move and stretch the muscle at the same time adds additional tension, which can often lead to tears. (fitnessandpower.com)
One of the main purposes is to avoid blame and emotional suppression, which may cause additional tension at home. (wisegeek.com)
A lot of these minigames require some precise reaction timing, and added a good degree of additional tension to the game as a whole. (heypoorplayer.com)