Increasing the number of days per week of power walking from 3 days to 5 days is an example of increasing which training principle of fitness to improve your workout
Frequency
Intensity
Time
Туре

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.