At the same time- all of those activities require hard physical exertion, mixed with relaxation during stress. I can understand the motivation to try and skip the learning curve by participating in the so-called internal arts... but you can't. I believe all martial arts are internal and external.
Ding, Ding, Ding,.......We have a winner!
"The hero and the coward both feel the same thing, but the hero projects his fear onto his opponent while the coward runs. 'Fear'. It's the same thing, but it's what you do with it that matters". -Cus D'Amato