You've memorized your treadmill workout, and those minutes spent sprinting are not as exhausting as usual. If you're not challenging your body during those high-intensity spurts, you may not see as much change in your body as you're used to. Try elongating intense intervals, increasing your speed, or cutting your recovery period to challenge your body and shock it back into getting results. Shake up your routine with one of these high-intensity interval training workouts.
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