Drop your trail foot half a step back, resting on the toes only, with 80% of the weight on the lead foot. Hit chips from that base: leaning back is impossible. Then return to your normal stance keeping the weight distribution.
Face-on: at chip address the weight is split evenly or back, and during the stroke the body leans away from the target.
Frequently asked questions
What is the "Trail foot on its toes" drill for?
Set the weight forward for the entire chip
How do you do the "Trail foot on its toes" drill?
Drop your trail foot half a step back, resting on the toes only, with 80% of the weight on the lead foot. Hit chips from that base: leaning back is impossible. Then return to your normal stance keeping the weight distribution.
How long does the "Trail foot on its toes" drill take?
About 10 minutes per session, 15 reps.
Sources
Stan Utley (con Matthew Rudy) — The Art of the Short Game