Time To Go Back To The City

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As we were finishing on moving the wooden boxes into the inventory bag, which had like a small dimension inside that could store a large quantity of items inside, I saw Celeste carrying three of them leisurely. I had just noticed, but isn't she buff as well? And its not magic, she's just naturally that strong!

"What?" She asked as she put the boxes in the ground, and then I placed them inside the bag.

"Y-You're so built!" I said. "How is this possible? What's your Physique Tier?"

"I think I am 3, nearing 4." She said.

"Huh?! T-Three?!" I asked in shock. She was only like six years older than me but already had two and a half Physique Tiers above me… What sort of method is she using to enhance her Physique? Using the Mana Circulation Technique to enhance it seems to be the quickest way but it takes a lot of time…