in /at / around the park

So, are there all correct?

Vincent TeoCan I say,

They are having a jog at / in the park.

They jog in / at / around the park.

optilang

Vincent TeoCan I say,

They are having a jog at / in the park.

They jog in / at / around the park.

"To jog at the park" is fine.

I would just say "They are jogging in the park" for present prog.

"They jog at the park everyday" for present tense"

"having a jog" just sounds wierd to my ear.

Goodman"having a jog" just sounds wierd to my ear.

How does "They are having a picnic at the park" sound to your ear?
It has the ring of the future to me. What are they doing next Friday afternoon? They're having a picnic at the park.

HuevosIt has the ring of the future to me. What are they doing next Friday afternoon? They're having a picnic at the park.

On the other hand:
-- Look over there -- toward the park! I don't have my glasses. What's going on? What are those people doing?
-- It's nothing special. They're having a picnic at the park. And don't forge

Have a picnic is different than having a jog . Although we can say "having a jog" grammatically without breaking the rules, it rings odd to my ear. Let try this scenario:

Were are your children; they didn't come with you?
Oh, they are having a picnic/ field trip with their school today. They can't make it.

In that context, it's entirely acceptable. But if the question were "