I have been running for almost 2 years now, after pretty much never running before in my life. I have had the usual injuries (shin splints, sprained ankle, etc.), but nothing serious. I've always thought I was doing everything right, until I saw this video about the day after the marathon:

<http://www.youtube.com/watch?v=m-hCuYjvw2I>

The thing is, my thighs have never - not once - hurt after a run! My calves have hurt, as well as my feet, hips, etc. So what am I doing wrong? Or am I doing anything wrong at all?

Some sites suggest this could be because I have weak thighs, and the rest of my legs are picking up the slack. But I can comfortably leg press about 3 times my body weight, so I don't think that's the problem. 

Is this something to be concerned about? Or is it just marathon specific: I mean, I've never run more than a 10K.
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Berin Loritsch is mistaken in that Atkins would be meant only for weight loss. It is meant for prolonged use as well as any reasonable diet.

In Atkins you drop the carbohydrate intake to max of 20 grams per day for two weeks. After that you start gradually adding carbohydrates to your diet until you reach the point where you stop losing weight. Then you dial the carb intake back until you have reached desired weight. After that you can raise the carb intake a bit to a point where you don't lose or gain weight. The most probable mechanism for losing weight with Atkins is lessened hunger due to eating less carbs and more importantly more protein. This leads to less energy intake, leading to weight loss when the energy intake drops below energy expenditure. [More detailed description about different phases of Atkins](http://www.atkinsdietfreeplan.com/).

Paleo diet is basically based on some anthropology-based ideas on what some people ate during the paleolithic era. The basic idea is that this would be the diet we evolved to eat, so based on that it should be good. The problem is that people living in paleolithic era ate extremely varied diets based on where they lived. The diet itself is basically various meats and vegetables. Depending on whose paleo ideas you follow dairy and grains are allowed/disallowed. Generally on paleo diet you eat less carbs than is common these days. There are lot of sites about paleo around. Most prominent gurus are propably Dr. Cordain, Mark Sisson and Robb Wolf among others. 

Neither is really much evidence based (unsurprisingly little about any diet is). My advice would be that if you feel fine on one of these, then go ahead. You should take any health claims made on behalf of either approach with grain of salt. Though restricting bad carbs is good, there is lot of hype based on little evidence about either one.
There are many differences between the two diets but I think one of most defining is the kind of animal foods you are encouraged to eat. 

The Paleo Diet emphasizes lean game meat. You're not going to be eating a marbled steak or bacon on the Paleo Diet. You're going to be eating things like salmon, halibut, venison, bison, organic free range beef, pork, etc. These foods differ from traditional western animal foods because they are much lower in fat and have a higher amount of Omega-3 fats. 

The real goal of the Paleo Diet is adjust your diet to closer match those of our non-agrarian ancestors - the idea being that biologically our bodies have not had time to adjust to rapid change in our diet since the Agricultural Revolution.