Is Mom here? -She's upstairs hitting my speed bag. - How's the team?
妈在吗? -她在楼上打沙包呢队伍怎么样了?
英语百科
Punching bag
(重定向自Speed Bag)
A punching bag is a sturdy bag designed to be repeatedly punched. A punching bag is usually cylindrical, and filled with various materials of corresponding hardness.