Adjectives.

Here's a picture.

via

And here are some words that could describe it. 

          Smooth                     Casual                              Progressive                                  Controlled                              Sketchy                                                        Backward
                         Frictionless                                                Measured
Transcendent                                                       Slippy                                     Cool
Fucked-up                                                                        Collected
                              Calm                            Hunched                                   Retro
Free                                                                                                     Unemcumbered
                 Irie                                           Stylish                                  Unweighted
Soulful

Add your own.  Derek would have some of his own, if he bothered.