I still run and skip rope to help with the physical endurance. Do pick-ups/wind-sprints. Keep your form/alignments and move from yoru center.
When lifting weights, keep you form, alignment, and center. Visualize (project Ki) the full extensions.
I find regular heavy bag work has kept me physical and added to being a fully committed Uke.
Learn to relax and play enviromental sensory awareness games by looking for anything out of place. Sorry, not so physical, but really worth while.