Exercise the Diaphragm:

THE RELAXATOR BREATH TRAINER

https://www.consciousbreathing.com/product/relaxator/

The Relaxator Breathing Retrainer is a small and convenient tool to improve your breathing habits. It’s extremely easy to use—simply place the Relaxator in your mouth and when you exhale it provides an adjustable level of resistance, which, when used regularly, helps you achieve optimal breathing with a resulting increase in your oxygen uptake.

Exercise the Tongue:

REMplenish™ Myo-Nozzle & Straw

https://remasteredsleep.com/products/copy-of-remplenish%E2%84%A2-myo-nozzle-straw

This innovative device allows you to exercise your tongue and upper airway while you drink water, helping to reduce snoring and improve your ability to breathe and sleep. Plus, the REMplenish Myo-Nozzle & Straw Kit is the perfect alternative to plastic straws, allowing you to reduce your environmental impact while enjoying a better night's sleep.