How to do static leg lifts<br>Start with the basic leg lift. When you raise your legs from the hips, you can strengthen your hips, which will result in increased mobility and less lower back pain. To perform the basic static leg lift, lie on your back on the floor.
Back pain can vary in intensity.
According to the context back pain can be lowered, which is a variation in intensity.  Therefore the statement is definitely correct.
( z1 possible :ARG1 ( z2 vary :ARG1 ( z3 pain :ARG1 ( z4 back ) ) :ARG2 ( z5 intensity ) ) )