Kira - you definitely haven't seen any of my posts if you think everyone lifts or runs.
I can't run - at ALL. I abhor repetitive exercise (treadmills, steppers, etc.)
I DO lift - sometimes with free weights, sometimes with weight machine.
But mostly - I do whatever I feel like - yoga, pilates, wii, dance, weights, step, balance ball, walking ...
I think gyms have their place - they are wonderful resources for some. For me - I prefer the flexibility and price of my living room