In Hinduism, Amalaka Ekadashi, which is the 11th day of the waxing phase of the moon in the Hindu lunar month of Phalguna, is considered to be a day to cleanse the body, and aid repair and rejuvenation. It also marks the beginning of Holi festival celebrations, where people start playing with colours, which culminates four lunar days later on the full moon.
This day is a celebration of the amalaka or amla tree (Phyllanthus emblica), which is sacred for Hindus because of its association with the Hindu god Vishnu.
Here are some ideas for how you can observe this day according to Hindu tradition: