Standby assistance during exercises is required when the person has had a medical problem that has secondary consequences, e.g. hip and knee replacements, unhealed fractures, etc. They are not apt to comprehend the consequences, nor are they apt to follow precautions.
ACL 4.0 - 4.2
One action at a time may be followed in range of motion and strengthening exercises. Their counting of repetitions may be limited to 5 or 10. Someone will need to demonstrate the motion, count with them, and correct improper positioning.
Assistance will be needed to use horizontal and vertical motions and frequently check areas that have impaired sensation.
ACL 4.4
The person learns and counts up to 20 repetitions of horizontal and vertical range of motion exercises. On site supervision will probably be needed to initiate and sustain attention.
Incorporate desired actions in familiar activities, especially bilateral motions to prevent "guarding" affected extremity.
Supervise the exercise program to anticipate potential complications and check for the effects of impaired sensations.