Is it because it's the wrong environment and we're just trying to push stuff that doesn't fit?
还是因为大环境的问题，我们试图推动的东西并不适合？
2
If you're already fit, do classic push-ups. For both types.
如果你刚开始一个健身计划，可以进行碰膝盖的改良式俯卧撑，如果已经适应，进行传统模式的俯卧撑。
3
Some beginner runners are actually physically fit enough to run a certain distance, but they don't have the confidence or mental strength to push themselves farther.