There's no weight on the liftoff or the landing. The body is actually kinda stiff and the legs are almost toy-like, because there's no squash or stretch applied to this organic creature.
Look at reference footage of animals and envision the skeletal structure within them as you have a rig on this model. Limbs can bunch up in a creatures surface, like Stitch from Lilo and Stitch had a kind of bagginess from his fluff, fat, and excess skin that felt natural to his anatomy.
Even the dragon that this model was pulled from, possessed a musculature that reacted to his movements. And extreme poses gave way to a little bit of squash and stretch that you could expect from a creature like it.
That principle is going to bring your models to life, and recontextualize how you translate movement in your animations. Thumb through footage of, lets say, a Bobcat, Lynx, or Tiger making a similar leap (since it's no secret that the "How To Train Your Dragon" dragon was inspired by feline movements)
Dismiss the rigidity of any 3D model you have, and consider how you could make a model more malleable to sell the movement.
Does the torso twist? Extend and condense, like the accordion motion of a spine? What's going on with the skin, does it ripple from the landing?is there a slight bounce to the head or the suspsension/shock-absorption of the elbow? Etcetera.