Can we do it indirectly ? ?
for example if I want my knees to be more powerfull so that I can jump higher.for that I will need more powerfull muscles and ligments.for this I can have a surgery in my dream.
what I want to say is that if visualisation can help us in healing our body(The healing power of visualization | Wildmind Buddhist Meditation)
so why cant it help us to get more physical strength
lucid dreaming is actually better than simple visualisation,isnt it ?