Hi guys,

Please get professional advice about what exercises to do, as some that used to be in favour are now considered very dangerous - unfortunately Hoobley, the one you suggested with the leg lift and lower is one of these exercises. This is very dangerous for your back and abs, I would strongly advise against this exercise.

The ones where you are trying to pull your tummy in or hold it in while walking (make sure you keep breathing so you're not sucking in) are best generally speaking, as it is a light load/effort but you are still teaching the muscles what to do. Just take care!