Are you ready to put your fingers to work in a marathon? If you have a need for speed – on a different scale though – then this finger running app will put you to the test. It's really simple, Finger Marathon II uses your fingers, which act as your legs, to see who can complete a race. The Lite version is a free download on the App Store while buying the full version for 99 cents will allow you to see where you're at on the leaderboard. And if you do plan on paying, you'll be happy to know that proceeds from it will go towards Mind which is a mental health charity in England & Whales. As with every kind of game, just give yourself plenty of rest between sessions.