Sometimes, we definitely can push too hard. That's all too easy to do when you're training often, as I am. Beyond that, on Thursday and Friday, I trained in Aikido, Iaido, Yoga, and Kenpo. I'm in much better shape than a year ago, but that's still pretty intense. Thursday's Aikido class was particularly punishing. I had my elbow wrenched to the side - the same elbow that someone had landed on at the seminar I attended two months ago. The pain's pretty well gone now, in fact after a good Aikido workout it felt better than it had since I'd first hurt it, though afterward it ached for a couple of days. For whatever reason, I chose that same session to try my first hardfall in about 18 years. Successfully, as it turns out, but it put a kink into my lower flank that followed me into the weekend.
It's also not uncommon for workouts to make my hip(s) hurt. I'm not sure if it's the butterfly stretch or the split (well, what I do doesn't much resemble a split, truth be told) or throwing sidekicks, but it puts a nice searing hot thorn into my hip joint for me. It's far from constant and usually little more than an annoyance, but naturally it raised its ugly, um, head after two rough days of falling (on purpose), stretching, twisting, and kicking.
The result was a couple days of soreness and aches - not the kind of muscle aches you expect from a good workout. Not even the hobble-inducing soreness I used to get in my quadriceps when I'd spend too much time in seiza. Thankfully, that seems to be largely a thing of the past. No, this was joint pain - joints and bones and tendons all scolding me for overdoing it. It's over now, and it should become less prevalent with time as I continue to train, but it's certainly a cautionary tale - it's possible to do too much, push too hard, and your body will let you know when that's happened.