  A phenomenological extraction of pressure within the proton has recently been
performed using JLab CLAS data (arXiv:2104.02031 [nucl-ex]). The extraction
used a 3-dimensional Breit frame description in which the initial and final
proton states have different momenta. Instead, we obtain the two-dimensional
transverse light front pressure densities that incorporate relativistic effects
arising from the boosts that cause the initial and final states to differ. The
mechanical radius is then determined to be $0.518~ \pm 0.062_{\mathrm{fit}} \pm
0.126_{\mathrm{sys}}~\mathrm{fm}$, which is smaller than the electric charge
radius and larger than the light front momentum radius. The forces within the
proton are shown to be predominantly repulsive at distances less than $0.43~\pm
0.12~\mathrm{fm}$ from the center, and predominantly attractive further out.
