I've just discovered this odd finger strengthening exercise. All you do is click your fingers, all of them (or at least 3 on each hand), to some kind of fast rhythm. You can do a silly dance with by circling your arms and making your hands look like dove wings when youd do it. 1 thumb upwards, one down looks cool. Changing combinations of arm circling, rhythm etc. might be a good exercise that bridges the gap between guitar finger exercises and dancing! I'm rubbish at it but I only thought of it today and it's quite fun.