Work-Up Exercises? What are some good (simple, easy) exercises to Work-up-to- the hard, challenging ones like pull-ups and one-armed push-ups?

for example, doing push-ups against a wall, or assist pull-ups?

Work-Up Exercises? What are some good (simple, easy) exercises to Work-up-to- the hard, challenging ones like pull-ups and one-armed push-ups?
Post Opinion