1.

As a child I  used to collect   stamps.

2.

I don't feel stiff after our game of tennis. I  am used to doing   a lot of exercise.

3.

Did you use to ski   more often before you broke your leg?

4.

My brother  used to complain   about feeling cold when we went sailing. But now he  is used to getting   wet and he enjoys it.

5.

She didn't like the sea in Scotland because she  isn't used to swimming   in cold water.