Open the Suf App on whatever device you use. Click on the “account” menu; its the far right option on the navigation when you log in, and has your Initial on it, and sits to the right of “passport”.
Select “sharing” from that menu. Training peaks is one of the options. That will take care of all of your future workouts.
For PAST workouts, click on the “Your Profile” option, and at the very bottom of the page is a section called “Account Actions”. the button there will export all of your past data, I would guess in a format that could be imported manually to Training peaks.