I had to think 'outside the box' for additional Physio exercises when DS2 was little.
My best but was a mini gym ball.
One thing I did was lay him across it, and roll him forwards and backwards up and down his tummy on it.
Another thing I did was to 'sit' him up on it (holding him), and bounce him up and down on it.
I got a sturdy baby push-along toy (look out for one that won't tip under their weight - I ended up getting a carpenter friend to make one with weights glued under the front, though used buggy weights on the front wheels of a plastic one before that).
What I did was sort of 'drape' him over the handle (
) and literally move one foot, then the other, then the first again, up and down the front room, and back again, over and over.
Then I used to put one of his feet on top of each of my feet, hold him around his chest (best way to hold a hypermobile DC, under the armpits but around the chest, prevents subluxes...), whilst bent practically double so that he was as upright as he could be, and step, step, step, step, step. Relentlessly.
I used to have a Galt dinosaur thing that I would prop him up on - it went right around the back of him - it's this one - Dinosaur cushion.
It really WAS relentless, but I didn't want to give up on him walking.