In my own opinion everything is done to make the animation look more vivid and attractive.

Solid Drawing, Straight Ahead and Pose to Pose

Animators should have solid basic skills and master animation production methods.

Staging

Character lines and scene layout are reasonable, guide the focus of the audience, so that they can fully receive the information they want to convey.

Use different locations to convey different messages.

Arcs

In addition to the mechanical texture of things, everything else has its own arc of motion.

Timing

Different frames of the same action will express different effects.

Squash and Stretch, Anticipation, Follow Through and Overlapping Action and Secondary Action

Express different textures in different ways, so that the overall picture looks more rich, vivid and real.

Slow in and Slow out

Like acceleration, and deceleration caused by the subjective consciousness of the performance or external factors.

Exaggeration and Appeal

All things in animation should be exaggerated on the basis of real physics, more vivid, natural, and have unique memory points.

Conclusion

All the pictures and performances should be concise and clear, the pictures and performances should have details, the overall layout should be reasonable, not bloated, and ensure that everything that appears in the picture is necessary. The process of production should be from the whole to the part, from the general to the detailed. And the production should control the overall rhythm, the primary and secondary clear, dynamic choice. Finally, we must ensure the vividness and realism of the performance while having a certain exaggerated performance.

AlanBeckerTutorials, 2017, 12 Principles of Animation (Official Full Series), 30 May,

Available at: https://www.youtube.com/watch?v=uDqjIdI4bF4 (Accessed: 23 December 2023).

Gravity: The gravity of the train and Spider-Man himself.

Elasticity: The elasticity of spider silk.

Pressure: Downward pressure caused by the train and Spider-Man.

Power: The power of the train (inertia).

Support: Ground facing the train and Spider-Man's support.

And the interaction force: between the train and Spider-Man, between the train and Spider-Man on the ground.

Spider-Man：Into the Spider-Verse (2018) Directed by Bob Persichetti, Peter Ramsey and Rodney Rothman. Available at: Tencent video (Accessed: 10 December 2023).

StuntsAmazing, 2012, The World's Best Parkour and Freerunning, 2 December, Available at: https://www.youtube.com/watch?v=NX7QNWEGcNI&t=7s. (Accessed: 23 December 2023).

When viewed from the side, the arm is straight, but when viewed from the front, the arm is slightly bent, holding the stone in the arms.

Don't crouch down and hold rocks

I think the jumping part has improved, but the landing part doesn't look as good as before.

The yellow ones are the weekly mission videos， the red ones are improvements and blue is the weekly study.

In white are some problems, solutions, notes and others.

There was also some feedback and reflection in the comments.

Hold down the middle mouse button and move the mouse right to view the content on the right.

For the second I used one ghosting and it started in frame 5, while for the third I used two ghosting and it started in frame 4 and was compressed backwards instead of unchanged. For the fourth, I did an even more dramatic transformation. And finally, in addition to the more dramatic distortion I did a squeeze distortion in frame 11, and I did the same in frame 13. In addition to that, I adjusted the curves to make them look a little smoother.