Better Balance: The Biggest Energy Saver of All
Many frustrated swimmers make the same mistake. They know their hips
and legs are dragging along far below the surface,... It saps their
energy faster than anything else can. So they grab a kickboard and
grimly start churning out the endless laps they hope will strenthen
their "problem" legs
Only their legs aren't the problem. That's because a poor kick isn't
what's keeping them from swimming better. It's poor balance.
文中强调臀部和腿下沉，所以身体在水中就不平衡，前进时阻
