Pearlsasinger
Up in the clouds
I'm another who thinks that he has enough 'condition' as he is but needs more muscle. I do wish people would realise that you cannot turn fat into muscle but you do need energy to allow the horse to do the work to build up muscle. There have been some excellent suggestion re lunging, pessoa, trotting poles, hill work, transitions. If he were mine I'd probably cut back on the canter work and increase the trot work, to build up the muscle more quickly.