The next thing you want in your gym bag are resistance bands.

健身包里放的下一个东西是阻力带。

Resistance bands are decent standalone workout equipment in the own right but are limited by their progressive strength curves that aren't well-tailored for many exercises.

阻力带本身是不错的独立锻炼设备，但受到其渐进式力量曲线的限制，这些曲线并不适合很多其它锻炼。