I was thinking since we're making suggestions to improve training now (the funitude of it anyways)
I was thinking of a Boulder Breaking...this could be implemented prefferably in the park map if it gets finished. You strike the boulder with whatever type of attack force your character uses (weapon, fist, etc.) As you strike the boulder, you gain an increas in attack an XP like the normal dummies (but slighty more exp, and requires to have advanced your race past human) but, you also get to vent your rage destroying boulders while doing so lol.
Hate to say this, but it's basically log training. Zeta has the same system of 'Punching' the 'bag/boulder/log' to train.
xD forgot about that >.> but then again, i barely play the DBZ games lol