When it comes down to assessing a decondtioned client (I never call them obese) Do what absolutely needs to be done for you to effectively do your job to meet the clients needs. You don’t always have to go 1,2,3, with ever client.. hence why were called personal trainers. Make them feel comfortable and at ease, explain why you need to do the assessments your doing and how its going to translate into an overall POSITIVE training experience.
You need baselines.. so at the bare minimum
Before Photos (anterior, sagetial, posterior)
Girth Measurements (again depending on the client, don’t let them get warped around this numbers game)
Possibly base line walking test on the treadmill, using the Ebbeling Single-stage Treadmill Test.
Tracking clients data from session to session also helps reinforce positive experience, as they can visual see more reps/weight done pr a certain exercise.
Hope this helps.