The most common injury is muscle strain , spang said .
斯潘说最为常见的伤是肌肉拉伤。
Spang designs multi-tapped transformers for these applications .
斯潘设计多抽头变压器为这些应用。
" Much of their activity is kind of crammed into the weekend , " spang said .
斯潘说：“他们多数的运动都是挤压在周末这两天进行的。”
Conservatively designed , the sound level is very low , making the spang transformer desirable for indoor applications in commercial buildings .
保守的设计，声音很低，使斯潘变压器理想的商业楼宇的室内应用。
Spang said many people hurt themselves when they have been inactive and then suddenly take on a major exercise program , such as training for a half-marathon .
