Spa treatments make patrons glow from the inside out, much like swallowing a colony of fireflies. Illuminate your layers with today's Groupon to Iris Wellbeing in Waterloo. Choose between or purchase both of the following options:

• For $15, you get six whole-body vibration sessions (a $30 value).
• For $45, you get two salt-therapy sessions (a $90 value).

Iris Wellbeing stimulates physical refurbishments with noninvasive, holistic therapies. The wellness spa invigorates physiques with six series of whole-body vibration sessions that promote weight loss by inducing muscular reflexology. Enlisting vibration equipment to gyrate their frames, clients simulate exerting workouts and washing-machine rides by standing on percussion platforms that transmit energy into the body, forcing muscles to contract and release continuously during the 10-minute pulsation treatments. In addition to flexing fibrous sinews, Iris vibration sessions also can increase flexibility, improve blood flow, and decrease the production of stress hormones that cause spontaneous locker-room-floor siestas.

During 45-minute salt-therapy sessions, chambers crusted with 3 to 5 tons of Himalayan rock salt nourish clients with healing aerosols and negative ions that alleviate respiratory problems such as allergies, asthma, and sinusitis. Wooed by a soundtrack of lullabies and the soft illumination of colour-therapy lights, patients 12 and older can unfurl limbs and prosthetic wings on thatched lounge chairs in the Ocean Retreat room, where synthesized salt-mine microclimates refresh their energy supplies and induce meditative peace. Visitors 11 and younger can also relish Iris's renewal treatment in the Healing Forest Salt Box quarters outfitted with a bounty of toys.