If you are trying to get a deeper understanding of the deep squat (hip in) you have come to the right place. Here you will find all you need to know.
Parallel vs. ATG Squats Part 1 — Advanced Human Performance
Perfect Squat Form: How to Do Squats, Goblet Squats, Back Squats
How to Perform a Proper Squat: 3 Common Mistakes to Avoid
How to Build Proper Squat Form with Squat Therapy
Should You Squat Ass-to-Grass? The Debate is Over - Steel Supplements
How to Squat Properly
A Beginner's Guide to the Squat, Fitness
STOP Doing Squats Like This (4 MAJOR Squat Form Fixes)
A Coach's Guide to Barbell Squats for Beginners