Waist trainers are no better than sit-ups for working your abs

When it comes to working your abs, waist trainers aren't worth it. They are no more effective at engaging the ab muscles than the tried-and-tested sit-up

Sit-Ups vs. Crunches

What Are Core Muscles? The Role of Each Core Muscle and Best Exercises

Best workouts to target certain parts of abs : r/coolguides

Are Sit-Ups or Crunches Better? - SET FOR SET

The 10 Benefits of a Strong Core, According to Trainers

Crunches Vs. Sit-Ups—Which Exercise Is Better?

22 Best Core Exercises to Build Strength & Stability

How long does it take to flatten a stomach with a waist trainer

How to Do Crunches Correctly — Plus 14 Variations

Beginner Ab Workout Without Crunches - Postpartum Ab Exercises

The Secrets to Perfect Sit-Ups

Do Sit Ups Give You Abs? The Truth About Why They Often Don't Work

Crunches and Sit-Ups Can Be Bad for Your Core — What to Try Instead