This stretch might make you nauseous at first, but as you get used to it, and the fascia starts to release then you will gain the ability to stretch deeper in the muscles.
To start this stretch, walk towards a wall and stop about and arm length from the wall. Bend forwards and continue to move towards the wall until you can comfortably put most of the weight on your back and less on your feet. There will still be some weight on your feet since they will be holding you upright.
Keep in mind that the further away you put your feet the more your feet will be forced flexed and the more intense the stretch will become. It’s up to you to find the distance that you can tolerate.
Hold onto your elbows and let the weight of your upper body pull you towards the floor. Relax as much as you can. Everytime you breath out you want to relax closer and closer to the floor. If you touch the floor and no longer have enough weight to help gravity pull you down elevate your feet so that you will have more distance between you and the floor.
You can do this stretch with your feet slightly apart, and with your feet together, and everywhere in between. Take 3-5 breaths in every position you wish to train.