Balance in life is the most difficult of all challenges. Balance work, play, recreation, desires, money, family and foremost of all religion and you have really done something!!! The picture is slightly misleading (although true as far as it goes) in that it is not just your heart and head, but also your physical condition that needs to be balanced.
Consider...
1 Thessalonians, Chapter 5 (WEB)
23 May the God of peace himself sanctify you completely. May your whole spirit, soul, and body be preserved blameless at the coming of our Lord Jesus Christ.
We exist in a multifaceted existence as the Thessalonian passage illustrates. So, why not balance that existence accordingly? God is the Father, the Son and the Holy Spirit. The Father directs, the Son materially interacts and the Holy Spirit empowers. Since we are made in the image and likeness of God, why not imitate this in our "balancing act"? Allow your brain to direct, your body to follow and your heart to motivate!!! Act as one, because that is our composite nature.
Now all we have to do - is just do it!!!
Are you listening, Gary???