Worshipping the Lord in Spirit and in Truth is worshipping the Lord Jesus in His HolySpirit and His Words. The HolySpirit is the SpiritOfChrist Jesus. When He is in us we are enabled to worship in the SpiritRealm, not just in the PhysicalRealm.
Worship in the Spirit takes an individual from the limitations of rational thought and form to revelation of the glory of Christ Jesus Joh 17:5.
As we step into the SpiritRealm we are transcendentally taken into a higher consciousness of the LordJesusChrist and so worship Him in His HolySpirit.
The Truth aspect of worship involves knowledge of and understanding of who we are InChrist so that we grasp our qualification to boldly enter into the HolyOfHolies.