I'm intending to join the TA in the next couple of months, but before I do I'd at least like to get back to my old level of fitness before I'd become a career desk-jockeying civil servant (before my suits shrank and the tabs took their toll). I've started playing a lot of 5-a-side and going running. I'm not expecting any miracles in the fitness department quite yet, but I'm worried by the number of injuries and random pains I'm picking up. My knees aren't the best, partly due to an active basketball hobby for 10 years and partly due to me now being a fat barsteward who still tries to work out. I'm wearing supports and reducing impact with decent footwear, but still managed to pop something at footy last week. It's fine now, and I jogged on it yesterday, but I could barely walk for about 5 days and it's a worrying sign. Similarly, when jogging, I regularly find my ankles aching, my ankles are aching, or my lower back starts to go. It's nothing major, but the constant pain starts to affect the jog. I'm pretty sure the knee and ankle problems can be sorted by shifting the weight, so I'm working on that. I also know how to strengthen my lower back and take that out of the equation. Currently my main concern is the shin splints, because I expect to be doing a lot more running once I've signed up and I certainly don't want it affecting my entry tests. Are there any exercises I can do, or any change in technique, to avoid this or my other problems in future?