It's different for everyone. Historically it's a spiritual act and many people (myself included) still hold that belief. There are specific religions and tribes linked to using suspension for various religious and cultural rites. Personally I don't have a specific religious belief but for me it gives me a spiritual feeling. Sort of a hard thing to explain. Additionally I find a lot of strength in being able to endure pain. It's therapeutic to be able to push myself past what I know will be potentially excruciating and talk myself through it. I didn't find suspension to be too terribly painful. Honestly I've had piercings that were much worse. The initial piercings are large gauge piercings and that can be potentially really painful but I had two piercers working together and so for a total of four hooks it was only two instances of pain. Getting off the ground was a burning feeling across my shoulders as my skin stretched and it was also just a lot of anxiety about just wanting to be up already. Actually hanging in the air felt incredibly freeing and exhilarating and I hardly noticed the hooks or the pain. With anything painful you get an endorphin rush and that can make most pain relatively easy to get through. Of course it's all individual and a very personal experience. It's not for everyone. Much like piercings, tattoos and other forms of body modification aren't everyone's cup of tea.