Race between "Stick and Donut" swimmer and "Three Sphere" swimmer

Artificial swimmers, presented in "Numerical Strategies for Stroke Optimization of Axisymmetric Microswimmers".

The movie was obtained by forcing the same energy consumption in all swimmers (.3 pico Joule).
The comparison is between a "three sphere swimmer" in which we fix the initial shape (the swimmer in the back), the same "three sphere swimmer" where however we do not fix the initial shape (the swimmer in the middle) and we let the minimization algorithm find also the optimal initial shape, and the stick and donut swimmer (the swimmer in the front).