I got Tibia Dorsi Flexion machine in my home gym. Good thing for strengthening dorsiflexion movement. Explanation of dorsiflexion is at the end of my post.
Here is youtube video of how it used:
Ankle joint complex explained:
Dorsiflexion is the movement which decreases the angle between the dorsum (superior surface) of the foot and the leg, so that the toes are brought closer to the shin. The movement moving in opposite directions is called plantarflexion. The same term can be applied to the wrist and hand, with movement of the palm towards the forearm termed palmarflexion.
Put more simply: it applies to the upward movement of the foot at the ankle joint.
It occurs at the ankle.
The range of motion for dorsiflexion is indicated in the literature as 15 degrees maximum in the majority of subjects tested.