On the bright side, there are plenty of activities that promote articulation, freedom of movement, and flexibility. Good options would be swimming, yoga, boxing, martial arts, or contemporary/improvisational dance. And another way to insure that you are keeping your body open is to stretch! All the time! For very minute you spend strengthening and shortening muscles, spend just as long lengthening. Inflexibility is fixed tension, and in my field, tension equals blocked experience.
Ultimately, the most important part of an actor’s physical training is release. Any new actor should first and foremost prioritize developing an artist’s body – not a shield, but an expressive, dynamic, responsive instrument. A body that will support their inner life, rather than restrict it. Before any fitness endeavor, ask “Does this support me as an artist?” After an actor has a developed dialogue of release with their physical instrument, they can begin to strengthen in more specific ways that support alignment and physical health. But this requires a strong foundation of physical training.
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