Calisthenics Unity

So even though I am not a beginner I want to start from level 1 and make my way to level 30. However, level 1 has exercises like negative pull ups and negative dips. Are these exercises for beginners? If so, can I just replace them with regular pull ups and regular dips to make it more challenging?

*This question is to Chris but if anyone else can help me out I would really appreciate it*

Thats what i did tbh

You shouldn't change anything, just do them with proper form and don't rush it. It will still make you decently tired and work great, also, the levels quickly rise to the challenge.

Thanks guys!