While I've been practicing Karate, and keeping myself active at my job, I know that I won't be truly fit until I make the attempt and work towards it. Problem is, I'm not too sure what to do; For the last several years, I've been dealing with lower back and hip issues, and I've been afraid that doing weight training would aggravate them. I've been doing resistance bands, but I would like to do some light weight-training. I've also been doing calisthenics on and off. I'm mainly focusing on strength-training and trimming the waist. Can anyone here offer some advice on what to do, as far as exercises go? What routines, if any, do you personally do?