Wikipedia
Pundalik or Pundarik is a central figure in the legends of the Hindu god Vithoba, generally considered a Vaishnava deity identified with deities Vishnu and Krishna. He is credited to have brought Vithoba to Pandharpur, where Vithoba's central shrine stands today. Pundalik is also perceived to be the historical founder of the Varkari sect, which is centered on the worship of Vithoba.
Pundalik was the oldest Kundalini Yoga practitioner. As He was the master of Kundalini Yoga, people used to call him as Kundalik. Later after several years, Kundalik become Pundalik. He symbolised Kundalini energy in the form of Lord Vitthal also knows as Lord Pandurang after his name Pundalik. Pandharpur's Vitthal was not incarnation of Lord Vishnu or Lord Krishna but the symbol of the Kundalini Energy. Though spiritually the same energy dwells in all.
The brick on which Lord Vitthal is standing is the basic chakra of Kundalini energy known as Muladhara Chakra. Both hands like bows represents Ida and Pingla nadis which crossovers at the central body of Sushumna or Bramha nadi. The body of the deity represents female form of the energy the Shakti and the Linga at the top of the deity represents the Purusha the Shiva. Kundalini energy when aroused by meditation reaches to the top of the head, known as Sahasrara chakra.
The Kings and other nobles were the devotees of the Pundalik and they built the famous Pandhpur's Vitthal temple. The age old practice of the Kundalini Yoga converted the shrine into a holy place and truth seekers from all over the world were directed here by the divinity to activate and raise their Kundalini energy by very natural process of the Bhakti, the highest form of Love anyone can express.