Untrained elderly men get markedly fitter and healthier as a result of playing soccer. After only four months of twice-weekly one-hour training sessions, the men achieved marked improvements in maximum oxygen uptake, muscle function and bone mineralization. The study revealed that inactive elderly men improved their maximum oxygen uptake by 15% and their performance during interval exercise by as much as 50% by playing soccer for 1 hour two times per week over 4 months.