![Joint- and muscle-driven versions of the squat-exercise biomechanics modules integrated with the ARED/VIS module.](https://appel.nasa.gov/wp-content/uploads/2012/05/Integrated_squat-high-res-670x380.png)
The NASA Digital Astronaut Project
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By Lealem Mulugeta and DeVon Griffin Conducting human missions beyond low-Earth orbit to destinations such as asteroids and Mars will require substantial work to ensure the well-being of the crew.