What exercises can be done anywhere with no equipment, not even a bar for the upper back muscles and is as easy to learn as a bodyweight push up.
- Pull ups could be your best bet. I suppose you mean "no equipment" as in no weights or rowers or barbells, etc. I'm not including such things as towels, gloves, cloth, in this list.
- The Superman Exercise: Check out this link for more detail. If you really really want no equipment, this is probably the only thing that works. You don't even need to have clothes on to do it :P.
- I could go on to list many more, but I'll save you the reading and just immediately direct you to this link. Normally, exercises that are body-weight oriented don't really require equipment. Check this link out!
Does this answer your question?