Alexa,

You've correctly identified what it is that makes your videos look amateur: quite bluntly, you are an amateur. You're using amateur equipment and doing things the way amateurs do them. The only way, literally, to make more professional videos is to invest a lot of time and money into improving. Making a video isn't one discipline but rather several:

• Acting --- because believe it or you can't just start talking and have most people find that interesting. You have to learn how to act and present the material in an interesting way. The only way you learn acting is from acting classes and tutorials

• Lighting --- there are principles, rules and techniques for lighting a set in a way that looks good on camera. These things are learned by classes and tutorials

• Composition --- there are visual art principles, rules and techniques for making your making things look good on camera: placement, arrangement, color scheme, etc. All these are learned by through classes and tutorials.

• Cinematography --- learning the angles, transitions and effects, when and how to use them to look appealing on video

• Sound engineering --- learning how to make it sound pleasing and how sound should compliment the visuals on screen.

Professional video production is generally done by a crew because most people have neither the time or the money to master every discipline involved in filmmaking.

So you need to decide just how much time and money you are willing to put into this because it will get very expensive very fast to get to the professional level.

As someone who watches fitness videos myself, I feel I could potentially be in your target audience --- meaning, this is a thing I would possibly watch. Do a search on YouTube for a channel called "Fitness Blender" because that's who I subscribe to for all my fitness videos. Their format is actually very simple and yet visually appealing. That may give you some ideas on how to redesign your set and how to compose your edits and graphics.

But I gotta warn ya --- even the Fitness Blender team, realizing the limitations of their own environment and equipment, dumped a lot of money into new gear and they built their own set from scratch just to get their videos to look as good as they look.

So ... how far are you willing to pursue this?