Creating Fitness Workout. Animations for My Website

Hello everyone.
I'm completely new to the Adobe ecosystem and would really appreciate some guidance from experienced users. I'm currently working on my fitness website, sixpacks.fit, where I publish workout and fitness related content. My next goal is to create professional exercise animations similar to those used in fitness apps and training platforms. However, I'm not sure where to start. I have a few questions. Which Adobe application is best for creating workout and exercise animations?
What is the recommended workflow for creating these animations from scratch? Should I create vector characters first in Illustrator and then animate them, or is there a better approach? Are there any beginner friendly tutorials, courses, or resources you would recommend?
My goal is to create a library of high quality exercise animations for sixpacks.fit, so I'd love to learn the most efficient and professional workflow from the beginning. Any advice, tutorials, or personal experience would be greatly appreciated. Thank you in advance for your help.