Planks are a great way to build core strength without putting pressure on your neck or back.
Side planks can also be effective for building core strength and improving balance.
Bird dogs are a low-impact exercise that can help improve posture and stability.
Dead bugs are a great exercise for targeting the lower abs and improving spinal stability.
Glute bridges can help strengthen the core and improve hip mobility.
Russian twists can be modified to reduce strain on the neck and back.
Bicycle crunches are a classic ab exercise that can be done without straining the neck or back.