Why II V I tracks are so effective
The II V I progression is short enough to loop constantly and rich enough to teach real jazz language. It gives you a repeatable space for hearing tension and resolution, targeting chord tones, and testing melodic ideas without the weight of a full tune form.
If you want one of the highest-return practice formats in jazz, this is it. You can keep the material simple and still work on phrasing, time, rhythm, and harmonic clarity.