[quote=@Lucius Cypher]
Ah, btw, could I do a Reckless Attack and Grapple? Grapple is an attack action (important to know so I can use it to maintain rage) but I don't want to burn a rage. I also wanna know if I could Reckless Attack+Grapple as an attack of opportunity, if that's okay with you.
[/quote]
Opportunity Attack is not an Attack action, due to its nature as a reaction. It is but [u]a single[/u] melee attack, which is why Extra Attack does not function with it either. However, I think this is one of those times when we can consider this needless bickering and allow a grapple attempt to be made. It makes perfect sense for one to be able to try it, so go on ahead with that if you want.

Reckless Attack doesn't work with that though. Grappling is not a weapon attack and it is not exactly "the first attack of your turn".