  We study the stochastic force dynamics of a model microswimmer (Chlamydomonas
reinhardtii), using a combined experimental, theoretical, and numerical
approach. While swimming dynamics have been extensively studied using
hydrodynamic approaches, which infer forces from the viscous flow field, we
directly measure the stochastic forces generated by the microswimmer using an
optical trap via the photon momentum method. We analyze the force dynamics by
modeling the microswimmer as a self-propelled particle, a la active matter, and
analyze it's energetics using methods from stochastic thermodynamics. We find
complex oscillatory force dynamics and power dissipation on the order of $10^6$
$k_B T / s$ ($\sim$ fW)
