Why are physical examinations necessary for mental health/brain injury benefit assessments?

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Dear Department for Work and Pensions,
Brain Injury or mental health claimant is examined to see how far he can crouch down, or lift a leg, he is asked how far he can walk and how long it takes, if he can touch his head or use a mouse, Can I ask why these questions are included in an assessment where the claimant has no physical disability but mental health problems.....
This from the Health Advisory Service "Where appropriate, you may have a physical examination which is designed to assess your function and is not the same as an examination in a diagnostic or treatment setting with a GP or Consultant.

Your verbal consent will be obtained for any physical examination to proceed, should it be necessary. You are encouraged to do as much of the examination as you feel comfortable with. You will not need to remove items of intimate clothing. A physical examination is not always required."
'A physical examination is not always required' but is ALWAYS carried out....
Can you point me in the right direction to find out why this is?

Yours faithfully,

Trudy Baddams

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no-reply@dwp.ecase.co.uk on behalf of DWP Health Services Correspondence, Department for Work and Pensions

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Dear Trudy Baddams,

I am writing in response to your request for information, received 8th
May.

Yours sincerely,

DWP Central FoI Team