low-impact          
adjective uk/ˌləʊˈɪm.pækt/ us/ˌloʊˈɪm.pækt/
 (运动)低冲击的
not involving one thing or person hitting another with a lot of force, for example not involving your feet hitting the ground when you run or jump
  Start with low-impact exercise such as walking or cycling.
 I hate going to the gym, but I do low-impact aerobics at home. 我讨厌去健身房,但我在家做低冲击有氧运动。 
  (尤指对环境)低冲击的
not causing much damage to, or having a big effect on, someone or something, especially the environment
  The emphasis here is on low-impact tourism.
 The electric car parked outside is a symbol of the couple's low-impact lifestyle. 停在外面的电动车是这对夫妇的低冲击生活方式的象征 。 
 - More examples
 - He argued that such a low-impact collision could not have caused those injuries in the plaintiff.
 - You don't hear about too many career-ending swimming injuries because the sport is relatively low-impact.
 - With rising gas prices and shrinking water supplies, wildflowers are a low-impact alternative to landscaped lawns.
 - He wants to preserve the trees and other plant life in the area, and the changes the city makes will be low-impact.
 - The low-impact option taken by some firms is to cancel bonuses but retain staff even if they are underemployed.