In terms of selective<unk>  weakness or poor flexibility muscular<unk>  is frequently regarded as an etiological factor in the onset of musculoskeletal disorders. There are a variety of areas that can be affected, each causing different symptoms hence there are also different treatments available, but in general cases<unk>  strengthening techniques were developed for the use on the weak or tight<unk> s.
Muscle imbalance
Personality changes
Voice change
Dark skin
Sensitive skin
Muscle weakness
Central nervous system depression
Dryness 