This sounds most consistent with an acute neck muscle strain/spasm from the exercise. In most cases it improves gradually over a few days. For now, avoid backward bending, heavy exercise and forceful neck stretching. Use a warm compress for 15–20 minutes, 3–4 times/day, and keep the neck gently mobile within a comfortable range rather than complete rest. A pain-relieving/anti-inflammatory tablet may help, but the appropriate medicine depends on your history of gastritis/ulcer, kidney disease, asthma, blood-pressure problems and other medications, so avoid adding multiple painkillers on your own.

You neck muscle may suffer from muscle spasm ,need antispasmodic managment

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