I am not and never have been an athletic person. In high school, I spent one day in a weight-lighting class on good faith, proudly wearing a shirt emblazoned with an NES controller, and quit the next day. I have never worked out, I have never been very active. The most physical exertion I got for years was all the walking around neighborhoods and campuses I had to do. My posture was never bad per se, but I've always had a problem that I can't seem to balance my weight on both feet; I'm always leaning on one.
Then, almost two years ago, out of desperation I got a job lifting boxes and loading trucks. When I started, I could barely tote 60lbs held to my chest, and was so exhausted by the time I got home I would be shaking uncontrollably. From a few months later through to today, I can tote 120lbs with good leverage and not too much strain, and I can literally sleep while I'm working and get home restless. Weirdly, despite improvement (read: creation) of muscle definition, I haven't gained or lost a pound since I started.
The important thing to take away is that I have greatly improved my fitness and physical health, but I don't know anything about proper exercise or positioning or anything. This has led to some problems. My health is better, but increasingly over the past few months, some nights I feel like I'm about to break apart at the seams. I know there are some people here who do exercise and know about staying in shape, so I'm asking for advice on some recurrent pains and oddities I'm having.
More than anything, my right leg hurts a lot. Right around my ankle and shin is the worst part, and I know I need better footwear for that. Some of it's just repetitive strain from doing the same movements all the time; even the lightest movement can get painful if you do it enough times. But the one that worries me is a tight pulling feel under my right arm. It doesn't actually hurt that much, and only comes up when I make the wrong movements, but when it strikes it's almost paralyzing, like my body knows it'll rip in half if I move that muscle any more. It comes and goes every few weeks; I'm probably just sleeping wrong though. There's also the little problem of my upper back fusing into a solid rhombus of bone, but I crack it loose when I can.
Now, I know I'm supposed to ask a doctor about physical medicine and not the Internet, but I already know what a doctor would say, "Try to stay off it until it stops hurting." And being my job, that's not an option. So I'm wondering if there's any calisthenics or stretches or whatever (as our safety staff reminds me) which I'm not doing right. Or any other tips, like muscle relaxers or something. I'm not asking for a miracle cure for joint pains or anything, but I know there's a lot of experience and technical knowhow to physical stress that I have no clue about.
The other problem is my body is taking on strange shapes. For reasons probably related to the aches, when I'm standing or walking in a "natural" position, my right foot points out almost sideways. It doesn't hurt to keep it pointed forward, but it does require a conscious effort. It could also be that I spend an hour or two a day driving, so my right ankle is always glued to a pedal. But for no good reason, the change that worries me most is my right arm. It's the dominant one obviously, so it gets the most work; consequently it's a lot bigger than my left arm. Especially in the shoulder; enough to make me self-conscious about it. I could just work out my left arm more, but I don't know if it works that simply.