Hyperextension (exercise)

There are two erector spinae, one on either side of the spine, that run along its length.

These are formed of three smaller muscles – spinalis, longissimus, and iliocostalis.

However the name 'hyperextensions' is a misnomer, because hyperextension means a movement where extension is performed at any joint beyond its normal range of motion.

[2] In fact, back extension beyond the normal range of motion has been found to be detrimental for the exerciser.

Hyperextensions during dead lift have been found to lead to lumbar disc pathologies and muscular spasms.

Back extensions being performed using a Roman chair for support
Back extension performed at an angle using an exercise ball
Diagonal back extensions performed on the floor
A 45 degree back extension bench (note the different type of leg support from the Roman chair)