If you have very flexible calf muscles, or as you progress you may need to use a step to achieve a better stretch.This should be performed instead of the gas
Calf Exercises
Pretzel Stretch Tutorial
Banded Hamstring Stretch
Calf Stretch, Calf, Plantar Fasciitis and more
Plantar Fasciitis Exercises
Ask a Trainer: How Can I Increase Ankle Flexibility for Swimming? – Triathlete
Elevated Calf Stretch AKA Step Stretch
Pretzel Stretch Tutorial
Stretching Exercises for Soleus and Calf Muscles