Calisthenics is a really easy way to push intensity at basically 0 risk of injury. They're all compound and depending on the variation could require high reps, but between push ups, pull-ups, squats, their numerous variations, and accessory work, I would challenge anyone to actually injure themselves while also being able to push to true technical failure.

It is very possible to injure yourself with calisthenics. Shoulder impingement or tendinitis from pullups with too much intensity/bad form for example. Weight is weight.

This is not good advice and please remove the “basically 0 risk of injury” wording. Mobility is a limiting factor and poor body positioning WILL result in injury. Barbells are safe, progressively overloadable, and learning to move them is a straight line is what most people need to do before a lot of calisthenics training. Most people can’t even do 1 pull up.

From my son's experience in calisthenics and looking around at the group he sometimes trains with, there are definitely a lot of overload/overuse injuries, at a range from just needing rest to bicep tears.

Lots of overuse injuries in calisthenics:

https://www.tandfonline.com/doi/full/10.2147/OAJSM.S394044

Poor form is possible with calisthenics and that leads to injuries or other problems.