been wearing a pouch for the last 8 years, i just carry what i need and put everything else in my bag.
i had a back injury last year unrelated to tool pouches. since then i've been given special excercise training with a therapist and my back has never been better.
i really think if you generally stay physically fit and healthy, you wont have as many problems.
Absolutely. A few stomach crunches and some squats and stretching a couple times per week does wonders. Never carry a bunch of tools on your belt. If you get no other physical activity besides electrical and surfin the net, your gonna break one painful part after another. Should be common sense.