I have a Moon Druid in a game that's still young and I made sure to take Athletics trained, so I would retain my training in Wild Shape.
My main reason is I'm planning on using the WildShaped form's enhanced Strength score combined with the Shove action under Attack Action to knock enemies prone or move them around the battlefield.
Sadly Grappling looks very underwelming in 5th Ed, possibly with the Grappler feat, but I'm suspicious.
I plan to take Mobility at level 4, and use that to gain the Pounce and Gore almost every round (unless the spaces are tight).
At level 6 use the Giant Constrctor Snake. Grappling with DC 16.