How many have trouble praying in the Spirit because they don't like what they don't understand, and many like to pray in tongue's because the enemy doesn't understand. Actually we enter God's presence with thanksgiving and the enemy is paralysed whether understood or not. But praying in the Spirit is like a wind acting on a sailboat, moving forward by the spirit in adverse circumstances by tacking into the wind of the Spirit.
That would make two that don't understand then, wouldn't it ? The one praying (you) ... and the enemy. But didn't Paul exhort all to pray with understanding also ? If praying in "today's version of tongues" is to be desired and beneficial, what does that render to our prayers expressed with our understanding also ? The entirety of this subject and practice is completely lacking in sound biblical understanding. Our Father knows our every thought and need before we ask Him. Living and praying in the Spirit simply means having one's heart, thoughts and mind focused and resting in Jesus Christ. Quit trying to "outsmart" the enemy and simply trust in God and His Word.