1. Move apart and return deliberately
Let the hands travel away from one another while your ear keeps them together. Aim for paired attacks and equal note lengths throughout the journey. Begin with RH on C4 and LH on C3, one octave apart. Both hands start with the thumb. RH ascends while LH descends; at the outer Cs, both reverse and return.
Play the outer C only once. The final C is a quarter note, giving the phrase a clear landing. At the widest point the hands are three octaves apart; this is a consequence of moving outward, not a change to the starting register.
Use the shared fingers as a first landmark
Outward, both hands use 1–2–3–1–2–3–4–5. Inward, reverse those fingers. The thumbs arrive together after the first three notes, but they are on different pitches: RH F and LH G. Say the fingers first, then name each hand’s notes separately so the apparent symmetry does not conceal the actual keyboard route.
- Play RH alone, then LH alone, maintaining the same pulse.
- Play only the first four pairs together. Stop and check both thumbs.
- Add the outer tonic, then practice the inward half separately.
- Join the halves with one clear turnaround and a quiet final landing.
Listen for: paired attacks, no extra accent at the thumb crossing, and neither hand rushing to reach its destination. Begin without pedal so uneven releases remain audible.
Checkpoint: you can stop at any pair and identify both pitches. If only the thumbs feel coordinated, shorten the exercise and listen to the intervening fingers.
2. Let each hand keep its own map
C major gives you the reassuring landmark of matching finger numbers. Take that confidence into the next key, while remembering that contrary motion does not mean identical physical movements in every key. A black key may arrive in one hand before it arrives in the other. Learn the pitch and finger route for each hand rather than copying a visual mirror image.
A focused transfer to G major
Start RH G4 and LH G3. Use the same finger-number sequence as the outward C-major example, but follow G major’s notes. RH meets F♯ just before its upper G; LH meets F♯ immediately after its starting G. The hands therefore play their black keys at different moments even though their finger numbers match.
Name the first four pairs before playing: G/G, A/F♯, B/E, C/D. Then name the remaining four: D/C, E/B, F♯/A, G/G. Return through those pairs in reverse, playing the outer G once.
Balance and range
Once the route is dependable, invite each hand to lead for a turn: play one pass with RH slightly more prominent and another with LH more prominent. Keep timing unchanged. This prepares listening independence without adding another exercise pattern.
Expand to two octaves only when each hand’s continuation fingering is planned. An endpoint 5 in a one-octave exercise may need to become a continuation thumb in the longer route. Use the scale chapter’s fingering principles rather than repeating the short sequence literally.
For minor work, begin with a clearly named natural or harmonic minor form. Save melodic minor contrary motion until you can explain each hand’s ascending and descending notes; the directions are opposite at the same instant.
Musical connection: find a phrase in your music where the outer voices diverge. Practice its actual note pairs and rhythm. A contrary-motion scale develops coordination, but does not prescribe fingering for every diverging passage.
Checkpoint: you can explain where the two hands encounter their altered notes, and can change their balance without changing the pulse.