1. In these belt-tightening times, cost-conscious workouts at home and at the gym topped the list of fitness trends for this year in a survey, followed by shorter. more time-efficient regimens, such as boot camp and Circuit training.
本句是一個簡單句。句子的主干是 cost-conscious workouts at home and at the gym topped the list of fitness trends.后面followed by...circuit training過去分詞短語作伴隨狀語。such as表示舉例。
語法重點：分詞短語作狀語
2. Boot-camp workouts and circuit training, both of which burn calories while building strength and endurance, will be among the most popular trends in 2010, as time-constrained consumers seek shorter, more intense regimens.
本句是一個復合句，主句是 Boot-camp workouts and circuit training will be among the most popular trends in 2010. which引導非限制性定語從句，修飾Boot-camp workouts and circuit training。其中 while building strength and endurance為時間狀語從句的的省略形式，省略了主語。as引導原因狀語從句。
語法重點：定語從句，原因狀語從句