Only lunge your horse with a cavesson!👍
You can use just a halter if they r really good.
No bridle, use a head collar and let your relax, variate between small and big circles and have as a goal that they stretch their neck down while still engaging their hind quarters.
Hope to helped !
A great tip would be make short and longer transitions so your horse doesn't get used to trotting after 20 seconds or cantering after 10 seconds