Janda Sit-Up
Exercise Data
Main Muscle Worked: Abdominals
Other Muscles Worked: None
Equipment: BodyOnly
Mechanics Type: Isolation
Tips: While there's some controversy to this exercise, I've found it to be a fun addition to training. Named after Czech exercise physiologist, Dr. Vladimir Janda, this is one of the most challenging sit-up variations as it completely isolates the rectus abdominals by eliminating the hip flexors. The performance of this exercise is done by sitting in a normal sit-up position, feet flat on ground but vigorously tightening hamstrings and glutes. This will cause the hip flexors to be inactivated in a process called reciprocal inhibition, which basically means that opposite muscles to the contracted ones will relax. The exercise can be done using a dedicated apparatus, having a workout partner exert pulling pressure on your calves (while you maintain your feet on the ground) or wrapping your legs over barbell and pulling back. As you begin the exercise, fill your lungs with air and in a slow (three to five second count) ascent, slowly exhale. Seems simple, but go ahead try it!