Sha’ban is a precious month for several reasons, namely because it is the month of the Prophet (SAW):
‘Rajab is the month of Allah, Sha’ban is my month and Ramadan is the month of my Ummah’. [Suyuti].*
*Please note that there is a difference of opinion regarding the authenticity of this particular narration.
The Prophet (SAW) used to spend much of it fasting, and it is the month in which Allah (SWT) raises the deeds of his servants. The Prophet (SAW) indicated that he liked for his deeds to be liften up when he was fasting.
Another benefit of worship and fasting in Shaban is that it an opportunity to train oneself in preparation for Ramadan.