Why do I sweat so much after walking?

I go for a walk on my 1 hour lunch break.

It's just a stroll around the city, mostly flat.

When I come back to the office, my armpits are sweaty and it's like water under my breasts.

I freshen up in the work shower room.

I wear deodorant.

I don't know why I sweat after just going for a. walk.

I wear tshirts not long sleeves

Why do I sweat so much after walking?
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