I start all my clients with a set of foundation movements. This is done with all clients to varying degrees. Novice exercisers often are not ready to do much more than begin to move all of the joints. Experienced exercisers often have develop compensations or poor mechanical movement patterns. Even elite athletes are not immune to having fallen into poor mechanical movement patterns. Also, the movements are quite good at uncovering ROM issues, movement and strength imbalances, etc. Many times these movements are very challenging for sedentary and obese clients. And serve as the initial exercise program design.
An assessment would be critical before recommending a specific program. Generally speaking, however, for someone who hasn’t exercised in a long time and is obese, I frequently recommend swimming and aquatics classes to take strain off the joints while still offering a muscular and cardiovascular challenge.