Originally Posted by Trsnrtr

Don't know if you're serious or not, this being the addiction thread and all, but the position on a tandem is different enough that different areas or portions of the leg muscles are being used. A tandem also is also sort of feels like riding a trainer or it does to me.

Recumbents are different, too. It takes 500-1,000 miles for the muscles to adapt to the different pedaling position. Tandems don't require that much adaptation for the muscles, but there is some.