While a smile is natural when you’re feeling great, it may also evoke health and happiness on a biochemical level — lowering stress, strengthening immunity, and regulating heart function. Try these attitude boosters:

• Think happy. Recall a funny memory, a person you love, or a magical beach sunset. Happy thoughts will show in your eyes and facial expression.

• Gravitate toward other grinners. Smiles pour out like sunrays, so catch them from someone who’s beaming. A smile is one contagious thing worth getting — and spreading.

• Smile with your body language too. Your stance and posture, how you hold your arms, and your vocal tone all contribute to the mood you portray. Stand straight, don’t cross your arms or slouch, and always make eye contact and speak in a friendly tone of voice.