Jarrett needs ongoing physical therapy in order to maintain and improve on his physical capacity and independence. 
Jarrett has naturally low muscle tonne and delayed motor skills so being involved in programs supporting this is critical to his ongoing wellbeing 

Up until about the age of around 8 he needed assistance walking on uneven ground or navigating stairs, with consistent therapy he is now able to wall unaided, and has been able to move on to master riding his bike unaided and without training wheels. 

Jarrett is still delayed in comparison to his age and due to his abilities can not participate in mainstream sports.