The plot for Here Comes the Boom starring Kevin James in the lead, is a very familiar one - clapt out teacher finds purpose again, snapping out of the funk to lead a noble campaign. In this case, it's (dubiously) saving the music programme from the axe on behalf of Henry Winkler's character, the struggling music teacher with newly impregnated wife. The only real negative of the film (let's get it out of the way first) is that James is so loathsome as the lazy biology teacher, Scott Voss, that he treads a very fine line of irredeemability, and unfunniness.
Happily though, the film picks up in the second half with Rocky-like qualities and we find ourselves rooting for Voss as he is repeatedly beaten to a pulp (thus the M rating). If you are a fan of the UFC, you should definitely see this film. I think some of the actors in it are actually from the UFC, including Mark DellaGrotte who is a Mixed Martial Arts champion and US representative of Sityodtong martial arts which originates from Thailand. He trains current UFC fighters in real life, but he is in this film more for just the wow factor.
You should also see this with your teenage kids if they are accustomed to violence in movies. Some of the scenes where James is getting pummelled are hard to watch, but the message is generally good for all those old fashioned reasons of "the more you put in, the more you get back" and others. The jury is still out as to whether Kevin James can hold the lead of a movie like this, but towards the end, I was genuinely impressed with the training that he'd obviously done. Apparently he was at it for 14 months prior and it shows. Also, keep an eye out for his spray tans, he really makes Henry Winkler look like the White Witch from Narnia, but that's besides the point.
If you love a good fight movie, if you're inspired by losers come good (who isn't), then it's quite likely you'll get a kick out of this film. The plot has some holes, but generally, we get the idea, and the formula is so strong it's hard to fail.