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The "mechanical properties" of hadrons have emerged as a new field of study in strong interaction physics. They refer to the hadronic matrix elements of the QCD energy-momentum tensor and related operators, which measure physical quantities carried by the quark and gluon fields inside hadrons, such as the momentum, angular momentum, and forces. These structures are studied theoretically using lattice QCD and effective theories, and measured experimentally through the connection with the partonic structure measured in high-energy scattering processes (generalized parton distributions). They can be interpreted in terms of classical concepts like a spatial distribution of matter, motion or forces, and open new possibilities for visualization and communication with other fields of science. The workshop will review the status of the field and assess the prospects for further developments in theory and experiment (JLab 12 GeV, EIC, hadron beam facilities).