This slaps! You’ve tried yoga, meditation and long walks to reduce stress — but have you taken a whack at spanking? “While it may sound counterintuitive, for some people, ‘impact play’ like spanking can actually help reduce feelings of stress and anxiety through pain, or as many players would term it, ‘intense sensation,’ ” Lisa Finn, a Brooklyn-based sex educator at Babeland , told The Post. Impact play can keep you in the moment, interrupting the fretful thought loops that particularly plague