Although I agree with the rest of the comment, I would suggest a less brutal activity, such as a hiking or bird watching.

These also require less equipment.

don’t give more to someone then they give to you

I tend to disagree on that one. Random acts of kindness/selflessness to people, even complete strangers, can bring bonus satisfaction to your life (and sometimes will be paid back). Make it a habit to give to people, when you have the chance, especially if it is low effort.

If you have people around you that just constantly leech off of you, then I agree: don’t let yourself be sucked dry.