地震 だ！と思 ったら上 の階 でデブが一生懸命 縄跳 びをしているだけだった。
When we thought there was an earthquake, it turns out it was just a fatty doing jump rope hardcore.
→これでも元ボクサーなので縄跳びは得意らしい。
Still, since he used to be a boxer, it seems he’s quite skilled at jump rope.
Vocab Breakdown
地震（じしん）：earthquake
思う（おもう）： to think/ feel
上（うえ）：above
階（かい）： floor of a building
デブ：a fatty, someone who is considerably overweight
一生懸命（いっしょうけんめい）：doing something to the utmost, very hard, like crazy, hardcore
縄跳び（なわとび）：jump rope
する：to do
だけ：only, just
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