サカモトの足 は空気 イスのつらさと、スマートフォンの振動 でプルプル震 えている。
Sakamoto’s legs were shaking from the pain of wall sits and his phone’s vibrations.
Vocab Breakdown
足（あし）：legs, feet
空気イス（くうきいす）：空気＝air, いす＝chair so literally air chair.
つらさ：pain but this particular pain has more of the feeling of endurance rather than just raw pain. Just pain is 痛み（いたみ）
振動（しんどう）：vibration
プルプル震える（ぷるぷるふるえる）：プルプル is a mimetic word that goes with 震える to mean trembling or shaking
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