Testosterone（テストステロン） - 自己啓発作家

Testosterone（テストステロン、1988年–）は、筋力トレーニングを起点に、仕事、生活習慣、人間関係や心の持ち方について発信する自己啓発作家。高校時代に渡米し、大学卒業まで米国で過ごした。学生時代には体重が110キロに達したが、留学中に筋トレと出会い、40キロ近い減量を経験。その後は会社経営に携わりながら、筋トレと栄養に関する知識を日本に広める活動を始めた。自身の経験をもとにした『筋トレが最強のソリューションである』では、仕事や人付き合いなどの日常の悩みと筋トレを結びつけ、運動を生活に取り入れる考え方を示した。SNSでの発信と並行して執筆を続け、鍛えることだけでなく、心身を守るための休息も著作の主題にしてきた。『とにかく休め！』では、休むことへの罪悪感や、職場・人間関係で無理を続けてしまう状況を取り上げ、休息の必要性を88のメッセージで説いた。中野 優作との共著『人生が変わる最強の習慣』では、二人が実践してきた睡眠、食事、意思決定、時間管理やお金の使い方などを35の習慣としてまとめ、体調と仕事、生活の整え方を具体的な行動から論じた。

Testosterone (born 1988) is a Japanese self-help author whose writing connects strength training with work, everyday habits, relationships, and mental outlook. He moved to the United States while in high school and remained there through university. Having weighed 110 kilograms as a student, he discovered strength training during his studies abroad and lost nearly forty kilograms. Alongside running a business, he began promoting strength training and knowledge about nutrition in Japan. In “Kintore ga Saikyo no Solution de Aru,” he linked everyday concerns about work and relationships with his experiences of training, presenting ways to incorporate exercise into daily life. Writing alongside his social media activity, he also addressed rest and the protection of mental and physical well-being. In “Tonikaku Yasume!,” eighty-eight messages explored guilt about taking time off and situations in which people keep pushing themselves at work or in relationships, arguing for the importance of rest. With entrepreneur Yusaku Nakano, he co-authored “Jinsei ga Kawaru Saikyo no Shukan,” organising practices from their own lives into thirty-five habits. The book discussed sleep, food, decision-making, time management, and spending, approaching health, work, and daily routines through specific actions.