The turnaround is a very common chord progression, occurring in many rock, pop (top 40) and folk songs. Turnaround 1 uses the I, VIm, IV and V7 chords which, in the key of F, are F, Dm, Bb and C7 respectively.
Appendix Three lists many songs which use Turnaround 1.
Throughout this study you should hold each chord shape while picking the bass notes, but not while playing the bass note runs. Remember to strum lightly and to concentrate on wrist movement rather than elbow movement.