So let's say you want to train, you should actually have to train against a dummy or have maybe a duel with the trainer (with weapons that don't do damage of course). So if you have a sword/blunt weapon, you would have to do a short sword or blunt weapon fight with the trainer. If you wanted to practice hand to hand, you would have to punch one of those wood things in oblivion (OUCH). For spells and the like you would have to cast it on your trainer, yourself or against a practice dummy. Things like acrobatics would require some jumping from platform to platform or athletics would require you to run a short distance. Sneak you would have to sneak by your trainer or pickpocket him and for security you would have to pick a lock. as A Marksman you would have to take target practising. The more you train the longer, more difficult or more numerous you do each of these activities.