I think of music in terms of energy levels, as it is difficult to compare music tastes.
Tom Jackson of Live Music Method uses a five-level distinction.
The middle (a three) is marked by cruise along songs, mid energy. Usually what is played in the radio.
A five is something high energy, all-out songs (for you). Usually a bit more aggressive, often in major keys.
A one is something soothing or very calm, often in minor keys, slower and with less instrumentation.
Oviously, twos and fours bridge those levels, and are sometimes played in the radio, too.
For training A+A style session I prefer solid threes, something to cruise along to. For me, this usually mean some good boom-bap rap and dancehall and some uplifting reggae. Sometimes I want more energy and listen to more aggressive styles (a four, like British Grime for me). When I am stressed from a long work day, I might choose someting more calming (a two), like minor key folk (e.g., Gilian Welch), or even something soothing like some minor key baroque piano music (French Suites by J.S. Bach for example).
I remember Pavel saying something along the lines of only listening to hard or soft music, avoiding the middle ground. Either Metallica or Carla Bruni...