120 BPM is the universal "middle tempo" of contemporary street dance — hip-hop, jazz funk, K-pop choreography all sit there. Not too fast to drill, not too slow to feel like music.
When you practice moves solo after class, the thing that goes wrong first is usually count drift — an 8-count phrase that lands on the wrong beat by the second run-through. Open this page, run the metronome at 120, uniform click, and let each beat be a checkpoint for your body.
A trick that helps: think of every two clicks as a sub-beat pair, every eight clicks as one phrase. Match the movement to the click directly. Eight counts in, you know exactly where you are.
The app pre-sets to 120 BPM, 4/4, uniform mode. To adjust, use the controls inside the app after it loads.