In general, those who strength train work opposing muscles - quads/hamstrings at the knee and biceps/triceps at the elbow, for example. Notwithstanding specific athletic performance needs (a very small population), it’s generally a good idea to balance muscle groups so that innate human biomechanics are not significantly thrown off.
In the same vein, joints should be worked in opposing directions. Knee extension/flexion and elbow extension/flexion, for example. In my book, the most important manifestation of this credo is with spine flexion/extension. While people perform many activities of spine flexion (forward bending), they rarely move into spine extension (backward bending). Considering only the gym, you see squats, burpees, deadlifts, sit ups, hamstring stretching (and more!) involving spine flexion. Only on rare occasions will you see a standing back bend or “cobra” or “upward dog” stretch on the floor. I have no problem with flexion; I just want balance. Public gyms provide a glaring example that people will attend to muscle balance but rarely joint - specifically spinal joint - balance, but this applies to everyday life as well. --Laura
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