Spinal Muscular Atrophy (SMA) Support Group
Spinal Muscular Atrophy (SMA) is a term applied to a number of different disorders, all having in common a genetic cause and the manifestation of weakness due to loss of the motor neurons of the spinal cord and brainstem.
Sperm quality might be impaired due to sitting. The scrotum gets to warm if you sit to much. A Swedish doctor has done a lot of research on the subject:
http://spinalis.se/welcome/about-the-spinalis-foundation/?lang=en
Sit without underwear and or pants if possible.
(I'm not a doctor)