I know other asthmatics at my school; we've had kids in wheelchairs train with us. Children or adults with bad knees or shoulders, arthritis or other health concerns are included as well; the instructors work with them to train around their limitations. One of our black belts even teaches a seniors' class!

If you're checking out a school, talk with the instructors about your concerns. Most schools will be glad to help you tailor their training to address your needs. And as always, it's a good idea to check with your doctor before starting any new exercise regime.

• I'm out of shape; I'll never keep up!
See above. If you see students with the flexibility of ballet dancers in a grueling workout you're sure would send you into cardiac arrest, remember they all started where you are now. Again, talk to the instructors about your concerns; they'll be glad to help.

• I don't know if I can afford this.
You can spend a thousand dollars an hour for personal training with a martial arts master if you want, but you don't have to. Most schools are surprisingly affordable; those with family plans can be even more economical. Many YMCAs, YWCAs and health clubs offer excellent martial arts training for a small fee in addition to the standard membership fee, which together can cost less than many dedicated martial arts schools.

As for equipment, weapons, safety gear and so on, do some comparison shopping before you buy from the school. Many schools sell equipment at cost as a convenience; many others mark it up for extra revenue. Check online or at consignment stores that sell used sporting goods.

Again, you can spend thousands of dollars if you want, but you don't have to.

— Greg Hartman