I ran during law school, but only for fun. At one point I was in 31 minute or so 10k shape - but consciously avoided get caught up in racing - law school was too much money (I wrote checks from a trading account that I had been operating since undergrad) to get caught up in races. It was an expensive, highly ranked Tier 1 school. And yet I did not find law school difficult - did not work at it more than 15-18 hours a week - did hold a part time job because it was foreign to me not to have a job and income, did do well (2nd in class, law review editor) - and found it to be a much more neutral experience than people have described. By neutral, I mean law school is what it is - you pay your money, an education is received in return, the education itself supports an economic system that parses out property rights and buying into the logic behind that is essential to success - without getting overly emotional or caught up in the day to day drivel and drama. Just learn the stuff, and it is not that difficult, by and large.
My guess is that people associate a lot of sturm and drang with law school because they haven't had the kind of life experiences that prepare them for it. I was not all that smart, really, but I had been on my own financially since age 17, paying for college on a Div. 1 scholarship and learning very early on that looking to anyone but myself to get started in life just wasn't going to work. The average law student with all sorts of growth, maturity and parent type financial issues just won't have the energy or bandwidth to compete with the sharks at a top law school - and sharks they are. And one other point - I was 24 when I started law school - and had just been married - too young, really, but what a blessing. I did not waste time dating and socializing and the like, my wife knew me from my running days and thought the whole idea of me going to law school was humorous - she didn't know me to sit down and concentrate on anything for more than an hour - yet, with her Ivy league education and with multi generations of uber education in her Jewish family, was pretty subtle and effective in letting me know just what quality, laser like intellectual work was about. Some pretty unique advantages, now that I look back on it.