Originally Posted by
TimothyH
You could use a trainer or going to the local soccer field might be an option.
Grass is softer than pavement.
Or do what I did, I used a (paved in my case) trailed with grass on both sides. I for example rode on the right side of the trail, slowed down and unclipped my left foot. If I fell, I would have fallen on my right, onto the grass. Rode several passes on both the right and left side to train unclipping from both sides.