Ever heard of Jack LaLanne? An American born in 1914, he became known as the father of fitness! Personal trainer to the stars, including the likes of Jane Fonda and Richard Simmons, he opened the first gym in the United States in 1936. Among his exploits: at the age of 60, he swam across San Francisco Bay from Alcatraz to the shore, all while being handcuffed and towing a boat. Not bad, not bad.