Original post by EinheriI don't know whether you could. My game is a mix of Judo/BJJ/Wrestling, not really striking except to setup takedowns and clinching (although I did boxing from age 14 to 16). I haven't had pure striking (not striking for MMA) classes in years. The contract is month by month, you pay a month at a time and aren't held to pay every month. I used to take a bus to the town centre and walk to Bushido, took about 30-40mins (total journey one way) from Beeston.
As for Krav Maga, and I'm probably going to be negged for this but oh well, I wouldn't bother. There is no aliveness in the art as all techniques are tested against compliant, non-resisting opponents and there is no sparring. The reason Judo, Brazilian Jiu-Jitsu, Boxing, Muay Thai, and Kyokushin dominate the mixed martial arts world whereas Aikido, Traditional Jujutsu, Tae Kwon Do, Shotokan, Kung Fu, et cetera don't is largely because the former spar hard and train with non-compliant, fully resisting opponents whereas the latter either do not at all or just do unrealistic point-sparring. Krav Maga claims to be deadly but you wouldn't know until you're in a real fight and in all liklihood getting destroyed by even an untrained brawler with a few streetfights under his belt.
For both Judo and BJJ there is a £3.00 cost per 2 hour lesson (which is amazingly cheap, especially for BJJ which is in more demand these days than there is supply of legit instructors). A lot of people with bad backs transition from Judo to BJJ for that very reason, BJJ uses more wrestling style takedowns in order to secure a dominant position on the ground than high-power throws intended to cause concussion and breaks from impact. BJJ focuses on ground fighting whereas Judo focuses on throwing, BJJ is understandably easier on your back. Both will teach you how to break fall and minimize injury though, I barely get bruises from even the hardest throws these days because I know how to minimize inpact when being thrown (in the same way that you often see pro-skateboarders come off from huge heights and get back up with a grin - they've learned to break fall). That said if you have a broken back or another serious problem that can be easily aggravated I'd advise against it - you can always try it out as first lessons are free.
How big are you and what is your body type? Tall guys dominate in open weight Judo but there are weight classes. I'm 185cm and a reasonably lean 98kg, so somewhat above average height and a heavyweight - I do best with hip throws, pick ups and shooting for leg takedowns so I have very much a wrestling-style Judo game. It depends on your build, height and personal preferences really.
Getting fit - I powerlift and do martial arts aswell as MMA and wrestling conditioning (kettlebells, bodyweight exercises, et cetera), I'd recommend a similar mix of anaerobic and aerobic exercise. The importance of diet depends on your metabolism and goals - if you want to lose fat then restrict calories and fat and sugar intake, if you want to get big and muscular then just eat as many clean calories and as much protein as possible.
If you've any other questions I'll try to answer them as best as I can - always happy to "talk fight".