Why don´t you try to relax a bit
? (this way it mean I suggesting, said suggestion means that you don´t actually succeed at doing it, you just can´t but you need to.)
Other example with infinitive:correcao-da-frase-i-always-try-to-relax-t13731.htmlWhy don´t you try relaxing a little bit
It is assumed here that the person you are talking to perhaps never relax or never relaxed, so you are offering him/her a new experience. That one of relaxing.
So it´s not a matter of being able to do it (the experience/the event) as above.
One example:“I realized it was never really about fear. I just had to let myself relax, so I started feeling better. Why don't you try relaxing, too, all right?
Anyway, by saying that, somehow the end result is the same. I mean, it seems like having some intersection in the senses and meanings as well.
Further reading:http://www.englishpage.com/gerunds/geru ... t_list.htmhttps://www.dailystep.com/en/blog/verb- ... infinitive