Cavalettis and stretch down and oit
Work and a muscle building feed like Baileys No 4.
Lots of lunging and long and low. Persistence is key
Ground work, lots of ground work
I can recommend training every day, but also aloy of cantering. Not to much in the beginning, try to build it up. First 4x 90sec then build up by 30sec and then you will come to 3 to 4 min. (After a week or 2)
Try giving him some feeding full of energy so you can give him less and still work har
Try to do hill work with her to get her butt muscles back and then when you’re riding her do different drills and patterns so that she works every muscle.