Moving in time with the bike by adjusting your body posture is so crucial. Bad habits of stiff legs and leaning your head forward can really interfere with traction on the rear tire.
These drills can help you overcome poor body posture and help you anticipate moving in time with the bike.
Website
https://www.trialsprogression.com
Apple app
https://apps.apple.com/us/app/trials-progression/id6499456060
Android app
https://play.google.com/store/apps/details?id=com.kj2147623317.app2