Craig Brian Larson
On December 29, 1987, a Soviet cosmonaut returned to the earth after 326 days in orbit. He was in good health, which hasn't always been the case in those record-breaking voyages. Five years earlier, touching down after 211 days in space, two cosmonauts suffered from dizziness, high pulse rates, and heart palpitations. They couldn't walk for a week, and after 30 days, they were still undergoing therapy for atrophied muscles and weakened hearts.
At zero gravity, the muscles of the body begin to waste away because there is no resistance. To counteract this, the Soviets prescribed a vigorous exercise program for the cosmonauts. They invented the "penguin suit," a running suit laced with elastic bands. It resists every move the cosmonauts make, forcing them to exert their strength. Apparently the regimen is working.
We often long dreamily for days without difficulty, but God knows better. The easier our life, the weaker our spiritual fiber, for strength of any kind grows only by exertion.