Bicycle Crunches, from The Grain Brain Whole Life Plan
In this brief instructional segment, David Perlmutter explains the value of core strengthening and introduces the bicycle crunch as a complementary exercise to classic sit-ups. He notes that sit-ups primarily work the central abdominal muscles, while bicycle crunches target the side (oblique) muscles. He describes the movement: lying on the back with bent knees, legs lifted, alternating left elbow to right knee and right elbow to left knee. He recommends performing the exercise for a full two‑minute interval, optionally repeating after a short break, and mentions that he places this exercise later in the program because it is challenging but highly beneficial. He emphasizes that a strong core supports overall body strength and helps reduce injury risk.
