It seems like a silly question, but there are many reasons why strength training in the setting of neurological disease and disability is an important part of not just rehabilitation but also healthy living.
Strength training not only improves the size of the muscle fibres (hypertrophy), but also improves the efficiency of the nervous system in activating those fibres more quickly and effectively. This occurs in the brain, spinal cord and where the nerves meet muscle fibres. This makes strength training an example of neuroplasticity, the process by which the nervous system can change its function and structure and adapt to the challenge imposed.
Strength training can be adopted by almost anyone with a neurological condition, even if you have significant paralysis, such as in quadriplegia. Neurological physiotherapists, who possess additional training and expertise in treating problems related to the nervous system, will understand whether you will be appropriate for strength training based on your medical history and overall health, and if further medical advice should be obtained.
Strength training in neurological conditions requires extra care, as often muscles that are weak have been in their deconditioned state for a long time and there needs to be additional consideration given to any changes in muscle tone you may have, such as spasticity. Strength training does not increase spasticity and on the contrary can reduce it. Where voluntary movement is not available, electrical stimulation may be a suitable strength training option.