When first starting to play Arms, a player will be prompted to first try some training sessions before getting into the ring. These sessions teach players not only the most basic of skills, but they actually help one progress to learning even the most advanced tactics and mechanics. Even if you don't think you need to Train, it will be very hard to achieve victory if you don't have all the ins and outs of this form of fighting down pat.
And after finishing all the training sessions - including The Basics, Beginner Punching, Intermediate Punching, Advanced Punching, Guard Breaking, Trading Punches, Don't Get Thrown, Rush Practice, Jump Practice, Anti-Counter Practice - it is actually recommended to participate in all of them once more to become a true master of Arms.