This is one of my favourite narrative expert reviews that discusses the benefits of human biologic springs like the Achilles tendon. These benefits can be summarised as follows: 

• Metabolic energy conservation
• Amplification of muscle power output
• Attenuation of muscle power input

Some really interesting mechanisms and insights for rehabilitation . I hope you enjoy!

Here is the link to the study:

Roberts, T.J. and Azizi, E., 2011. Flexible mechanisms: the diverse roles of biological springs in vertebrate movement. Journal of experimental biology, 214(3), pp.353-361.

See omnystudio.com/listener for privacy information.