Why Do Catholics Genuflect in a Church?

Catholics genuflect in Church in order to show our reverence to the True Presence of Christ in the Eucharist. Genuflection is defined as 'A reverence made by bending the knee, especially to express adoration of the Blessed Sacrament' (CCC 1378). As we walk into the house of God, a Church, we show our adoration for Him by kneeing before Him.