 The subject rests calm at the bottom until microgravity phase starts. As described above a spring forced linear sliding system will push his body mass up to about 300mm. After the test subject has reached its free floating position without any contact to the surrounding area bottom, he will perform a short effort crouching or stretching. From now on the subject should relax and is not allowed to move his muscles intentionally. At the end of microgravity phase, the sliding system will allow a soft landing on the foam pads. 