You need to do more than 1 session a day.
Your body needs the reminders on positioning.
Breaking a bad habit and making changes in positioning/technique is work and it is hard at times.
At 1:50 it is the first part of the set up.
Once the kettlebell is in raised and and your elbow is blocked externally rotate your arm.

The stretch on the link is an ab stretch not a low back stretch.
Pro Episode # 35 – MWod Pro-User Request Friday: The IT Band Primer