Ace and I went out earlier to buy him a new office chair (not for his job, but for our room). His old one had broken (quite badly) and it had to be tossed. The new one is pretty much the same as the old one was, but we only really need it to last about 6 months so that's not a big deal (and the old one lasted over a year before it started having problems).
On the plus side, the chair was on sale and was easy to put together. And now Ace doesn't feel uncomfortable sitting at his desk. And that means he can do his online training in the evenings (provided he's not distracted with other things).
All in all, a great purchase.