These are tips for training cardiovascular/cardiorespiratory fitness: 1. Vary your cardiovascular activity.
2. Train at the appropriate intensities.
3. Give yourself the appropriate rest intervals.
4. Progress!
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during longer space exploration trips, crewmembers may develop vision impairment risks and short-term cardiac atrophy or a decrease in the size, strength, weight, and activity of the heart during space flight because they can experience microgravity. in addition, the long-term medical condition is loss of bone mineral density and radiation exposure.