# Jodie Comer's PT Shares the 100-Rep Ab Challenge for Core Strength
Actor Jodie Comer's personal trainer recently unveiled the high-volume ab routine behind her strong core. The workout follows a 20-20-20-20-20 format, breaking 100 total repetitions into five equal segments of 20 reps each.
This rep structure targets the core through varied movement patterns without excessive rest between sets. The approach allows exercisers to accumulate volume while maintaining intensity throughout the session. High-rep ab training like this can build muscular endurance in the rectus abdominis, obliques, and deep core stabilizers when performed with proper form.
The 100-rep framework isn't new to fitness science. Research supports high-volume training for muscle hypertrophy and endurance gains. However, success depends on exercise selection. Different movements during each 20-rep block create varied stimulus across core muscles. One block might focus on flexion exercises like crunches, another on anti-rotation work, and another on isometric holds.
Form matters intensely with high-rep core work. Momentum and improper alignment reduce effectiveness and raise injury risk. Practitioners should prioritize controlled movement over speed. Starting with bodyweight versions helps learners master technique before adding resistance.
The routine works best within a broader fitness program. Core training alone doesn't produce visible abdominal definition without complementary strength work and nutrition adjustments. Diet plays an equal role in revealing abs since muscle visibility requires low enough body fat.
This style of training suits intermediate to advanced exercisers with existing core strength. Beginners benefit more from lower-rep work and foundational stability patterns before attempting 100-rep challenges.
The PT's recommendation reflects a practical approach to core conditioning. It combines high volume with structural variety, using a simple format anyone can track and