When you flex your muscles you are contracting them. When your muscle fibers gain tension through Actin and Myosin crossbridge cycling they may shorten due to the tension. This is called muscle contraction
Anaerobic, fast twitch muscle fibres (or white fibres as they are known) as they provide large amounts of power over a short period of time
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Some specific types of mental health problems are notably more common in people with learning disabilities than in other people, including schizophrenia (Cooper et al., 2007c; Turner, 1989), bipolar disorder (Cooper et al., 2007b), dementia (Cooper, 1997a; Strydom, 2007), ADHD (Emerson & Hatton, 2007), and pica.
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