No man has the right to be an amateur in the matter of physical training. It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable.
Examine the people who’ve had the most success in their career and personal life and compare them to those whose bodies are weak and de-conditioned. Compare the time in and out of hospitals and doctors’ offices versus the time available for getting and keeping their respective bodies strong and resilient; the time confined to bed versus the freedom to do what they like. Which would you prefer?