Back pain

So here's a list of stuff that I am not allowed to do:

• static plank
  
• leg lifts
  
• crunches
  
• pull ups
  
• v-sits
  
  

Some of these exercises actually can put pressure on the lower spine, especially when one isn't quite strong enough to hold proper form, which might be the reason why one got injured in the first place.

IMO it's better to practice safe, non-static exercises, i.e. the pilates knee stretch:

Pilates Knee Stretches on the Roller - Women's Fitness - YouTube

This would be an exercise that requires you to breathe and go through the movement, rather than fully bracing into one static position. You can up it a notch by doing it on a gym ball, then you have an instability component in there that seriously works your deep abdominals.

Other exercises would be squats and lunges on a bosu ball (like a half ball), one legged standing on a bosu ball, kneeling on a swiss ball (or standing if you're really good), squats with a swiss ball between you and the wall to protect your spine, and if you have to do crunches, also do them on a swiss ball to protect your lower spine.
what about wearing a weightlifters belt, to do some exercises?