Related Clues:

• Fleeting muscle problem
• Make the first move
• Onset
• Involuntary muscular contraction
• Dive in
• Many solvers do it here
• Muscle malady
• Brief shock
• Get cracking
• All the clues in this puzzle do this with 36-Across
• Get the ball rolling
• Found
• Hiccup
• Contraction
• Button word, sometimes