My training in Goju was probably the most physical intense training I've ever done. Punching and kicking until you have a pool of sweat around you. Limb conditioning until your arms and legs are throbbing. Smart yet hard sparring then grappling afterwards. My Goju instructor is probably the toughest and most knowledgeable out of all my other instructors. I can't attest with the whole "Street Fighting" aspect, but I can tell you my Goju training was the most physically challenging thing I've done. I agree with one of the other posters, the training culture you are in plays a tremendous factor in your capabilities. In other words, you're not going to get the same results training with children than you would training with tough dedicated students. It's more about the environment opposed to the style or system itself.