英语翻译The weightless poses can be used to strengthen the core

英语翻译
The weightless poses can be used to strengthen the core as well as relieve aching joints and stretch tight muscles.
strengthen the core

你所提问的话,原文来自New York Times：
略览后,我们知道,文章说的是一种称为“反重力”的瑜伽,你所问的句子那段所讲的内容是：要人在吊床上做出传统瑜伽所要完成的动作,云云.
至于什么叫the core呢?我们来看看外国网站的定义：The core is an array of muscles from your chest to your hips.They maintain balance,ensure stamina,keep you upright and protect the routes between your brain and your appendages.
There's some disagreement on the scope of the core.Some say it's the midsection from the neck to the pelvis -- about 50 muscles.The more common definition is that it starts at the diaphragm to just above the pelvis,or the "pelvic floor." The National Institutes of Health describes it as the centre of everything,comprised of 29 muscles.
据此,我们可以理解一下这个句子：可以用这种无重力的姿势来增强胸、腹、臀部肌肉,缓解关节的疼痛,舒展紧绷的肌肉.
Gym Class:AntiGravity Yoga
By KAREN BARROW
Did you ever see an interesting class at the gym that you were too intimidated to try?Or maybe you need to freshen up your current workout routine?
The new Well video series Gym Class is here to help.Each month,I’ll take on the role of fitness guinea pig,trying out new and unusual exercise classes and rating them for difficulty,intimidation factor,intensity and fun — all from the point of view of an easily bored,slightly klutzy treadmill runner.
For my first Gym Class I tried AntiGravity Yoga,a fitness class that adapts the poses of traditional yoga for a large silk hammock raised off the ground.Sometimes called suspension or aerial yoga,AntiGravity Yoga was developed by Christopher Harrison,a former aerial acrobat and gymnast who found traditional yoga too hard on his injured wrists.The weightless poses can be used to strengthen the core as well as relieve aching joints and stretch tight muscles.
“People show up because it’s fun,but they come back because they feel healed afterwards,” he said.