I swear there are too many BJJ instructors who make students do hundreds of sit ups every week during classes .
There are a lot of articles based on research showing that sit ups are not as effective as most other exercises such as planks in building strong core muscles. There are a waste of time.
There are a lot of articles based on research showing that sit ups are not as effective as most other exercises such as planks in building strong core muscles. There are a waste of time.