Now here's a funny thing. I've just been to a yoga class where the teacher told us that if you press down through the base of your forefinger it will activate your tricpes brachii (that's the muscle in the back of your upper arm that if not tended regularly will release downwards in an unattractive, pendulous form).
Can this be true? Standing at my desk and pressing said finger on my left hand downwards, while resting by right hand on my left triceps, it did seem as though there was some tension. Isn't that odd?