Partial curl-ups and trunk lifts are types of floor exercises. Both exercises are part of the FitnessGram test used to assess physical fitness in school children, according to Topend Sports.
According to Baylor Health Care System, a partial curl-up is similar to a sit-up; a person lies on her back and curls up halfway while keeping her head and neck aligned with her shoulders. A trunk lift is used to test back strength. East Carolina University describes the following procedure for a trunk lift: a person lies on the floor face first and then lifts her upper body off the ground as far as she can. The instructor then measures how high she was able to lift her upper body.