Here's a fun two-for-one exercise for you and your horse!
How to safely cross logs
How to Handle Hills
Here best illustrates why your horse needs to be an equal partner when navigating obstacles. Gunner has this tricky log crossing under control. Had I been a backseat driver, I would have hindered him. I have always allowed Gunner (and all my horses) two freedoms: 1) if he’s curious, I let him touch obstacles with his nose and 2) I loosen his reins so that he can put his head down to see where he’s going. Because of these two simple leeways, my horses rarely refuse an obstacle. You have to realize naturally horses are suspicious of the unknown. Giving your horse the freedom to investigate instills trust for both of you.