我更喜欢用自由重量训练，因为它们能锻炼更多的肌肉。

I prefer using ___free-weights for my workouts because they engage more muscles.

健身房的新手应该从自由重量训练开始，因为它能更好地激活全身肌肉。

Beginners at the gym should start with ___free-weights as they engage muscles more effectively.