How to do a backbend against a wall<br>Find a good, clear spot. Find a wall space that is clear of any obstructions such as furniture, plants or sharp objects. It should have nothing that could injure you near it.
You should not do a backbend against a wall with a picture hanging on it. 
If a picture is hanging on the wall, it is not a clear spot, and therefore, you should not do a backbend on it. 
( z1 recommend :polarity - :ARG1 ( z2 do :ARG0 ( z3 you ) :ARG1 ( z4 backbend :location ( z5 against :op ( z6 wall :ARG0-of ( z7 have :ARG1 ( z8 picture :ARG1-of ( z9 hang :ARG2 z6 ) ) ) ) ) ) ) )