Most people started swimming when they were very young which in general was a 'sink or swim' kind of experience. Over the following years a freestyle stroke probably developed that was inefficient where breathing becomes an issue with the result that swimmers find themselves gassed after a few lengths. In swimming good technique is essential.
Total Immersion swimming focuses on a handful of core principles that apply to any body moving through a fluid medium. It emphasizes greater efficiency and lowered resistance by teaching drills and focal points that keep the swimmer's hips near the surface, reducing the drag profile of the body.