You walk out of Spinning class and realize that your hands are tingling.
Here's why: Tingling hands and sore forearms can be caused by weak abs. "If your abs are strong, you lightly rest your arms on the handlebars while your core holds you up," says Dr. Wright. "But weak abs make you bear down on the handlebars for all the support you can get." An hour later, hello, ouch!
Feel better: Tingling goes away once you stop leaning; soreness usually takes about a day.
Your new game plan: Strengthen obliques with bicycle crunches. Lie on your back, upper torso raised off the floor; twist to bring left elbow to right knee, then right elbow to left knee, cycling legs in the air. Do 2 sets of 20.
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