Activities while pregnant

Madison • Baby Boy making his way to June 3, 2016 ❥ madly in love with his daddy ❥ blessed.
I've been trying to find some helpful, yet fun ways to stay active throughout my pregnancy, and out of curiosity how safe is it to go out bowling with being 21 weeks, almost 6 months pregnant? 
I went bowling last night and had a blast! But I could tell it was tiring me out way too fast and I've noticed that I haven't felt my son move a bunch afterwards... He's very active right now, especially at night, but all that night in bed I didn't feel him move a lot.. I'm not or try not to be much of a worrier, but I wanna make sure I didn't do anything to have hurt him.