All these products can be used for Yoga. Some are exclusively for Yoga.
1. Spri Xercise Ball - elite come in other colors but the red is 65 mm. I'm 5'4" and use a 55 mm ball. These are easy to inflate and deflate slowly. At $50 this one is expensive but if your loved one will be using it a lot or several people in the household will join in then you want a good ball. You will get an instruction sheet but I'll give you some ideas of what you can do with this ball.
You can use the Xercise Ball to work your triceps very nicely. The triceps muscles in on the underside of your upper arm. Hold the ball...