I wanna just verify that these are excellent for building strength, both as someone who took weights class in high school with a good teacher, and as someone who’s had a lifetime of physical therapy (not for my arms specifically, but I’ve spent a lot of time in sports medicine centers). And again, if the vertical one in the first gif is difficult, you don’t even have to lean into it like that. Start standing, and only lean as much as it takes you to lower towards the wall.

And remember, many exercises can be modified in this way! I did an image search for “modified pull up” and got exactly what I was looking for right away, which is this:

Doing pull ups on a lower bar, or from the straps with handles that gyms sometimes have (called the TRX - they can also be used to support yourself during squats and some balance exercises) is a lot easier than jumping straight into vertical pullups, and lets you build up that muscle with exercises that are still comfortable and safe for you, so you can do more sets of more reps.

As a general rule, always start with lower-strain exercises and practice good form before you work your way up. You don’t want to have to unlearn bad habits that could lead to injury later as the difficulty increases.