We do offer adult beginner biking classes, however, without knowing where you are located, we can't narrow it down to your specific location. If you'd like to look for one-on-one instruction, you can look for locations here. We also offer group instruction with some classes scheduled in several locations (Fremont, Redondo Beach, Biltmore Park).
If one of these classes is not currently scheduled in your area, feel free to reach out to your local REI store and inquire if they are planning on offering one in the future.
Hope this helps, have a great day!
At REI, we believe a life outdoors is a life well lived.