How can I update my equipment so that I get workouts that use what I have (including the Swing Trainer)?

You can update your equipment list by clicking on the Equipment tab to the left of your dashboard (if you are using the website) and edit them there. If you are using the app, click on the menu button (three stacked lines in the bottom right of the screen), then click Equipment and you can add and/or edit them there. 

From the App: First, click on the green button that says Edit Equipment. To add a piece of equipment, click the +Add button next to it and If you need to remove a piece of equipment that you previously added, click the Remove button. The "Buy" button is there in case you want to purchase that piece, and if not, you can ignore it. Once you are done editing, click the green Save button and go back to the home page/dashboard and open your Today's Workout for your program. 

From the Website: First, click on the green button that says Edit Equipment. To add a piece of equipment, click the + sign next to it and the picture will become colorized instead of black and white. If you need to remove a piece of equipment that you previously added, click the - sign and the picture will become black and white. The "Buy" button will remain there regardless if you have that piece of equipment or not. Once you are done editing, click the green Save button and go back to the home page/dashboard and open your Today's Workout for your program.