After reading about this, and watching several YouTube videos, I will be trying the Inversion Method Hair Routine. I will be doing the following routine for 1 week and documenting hair growth and thickness:

This method was originally found here.

1. Warming a blend of Castor and Almond Oil
2. Massaging my scalp for 4 minutes inverted slightly
3. Waiting 2 hours
4. Washing

Today, before the method, my pony tail is a flat 2 inches thick.

My length from forehead to tip is 25.5 inches.