When people ask Master Waller about cross-training he typically advises people to be cautious.
Why is this?
The problem is tension.
When people exercise they typically end up exerting. This results in
tension in the muscles and inflexibility in the joints.
The problem is not with the exercise, but rather with how you do the exercise.
If you can keep tension-free, then do whatever suits you.
The one kind of cross-training that never works is mixing two internal and
external martial arts
The tension you learn in the other style (and the bad body use habits) are
always detrimental to your tai chi.
Master Waller does not cross-train.
The training methods in our syllabus are extensive and offer an extremely
comprehensive, balanced daily workout.