为了维持心血管健康，医生建议将剧烈运动纳入每周的日常锻炼中。

To maintain cardiovascular health, doctors recommend incorporating ___strenuous exercise into your weekly routine.

竞技体育中对卓越的不懈追求通常需要艰苦而长期的训练制度。

The relentless pursuit of excellence in competitive sports often necessitates ___strenuous and prolonged training regimes.

由于恶劣的天气条件，这次救援行动尤为费力。

The rescue operation was particularly ___strenuous due to the harsh weather conditions.