treadmill

Living in a gravity-free environment, astronauts face the risk of osteoporosis, muscle loss and damage to the blood circulation.

The objects we use every day are invented based on completely different purposes. Even, few people know what their original origin is interesting.

It is hard for anyone to expect, the treadmill when new

Today, not everyone has time to go to the gym or places like parks to exercise regularly. Busy with office work, housework ... and countless other reasons have made many people