"Sloppy form" refers to the way someone performs a task or activity in a careless or messy manner, without paying attention to details or doing it properly.
Sentences with «sloppy form»
However, performing them with sloppy form and a wandering mind can badly hurt your shoulders. (fitnessandpower.com)
Don't be afraid to break out straps if you want to go heavy, but don't jerk and use sloppy form. (bodybuilding.com)
Even though the push - up is a pretty fundamental exercise, so many people do it with really sloppy form. (fitbodyhq.com)