Misunderstandings in defining al-Ibadah
Ibadah is Tawqeefiyah meaning nothing can be legislated concerning it except with a proof from the Book and the Sunnah. Any act which is not legislated by Allah is considered a rejected innovation as the Messenger of Allah said, "Whoever performs an action that is not ordered by us is rejected." [Agreed upon] meaning the action is rejected and not accepted. Moreover, it is recorded as a sin because it is disobedience.
The correct Manhaj (manner) of performing the legislated worship is moderation between being easy and harsh and between laziness and extremism. Allah says to His Messenger, "So stand you firm and straight as you are commanded and those (your companions) who turn in repentance (unto Allah) with you, and transgress not (Allah's legal limits)." [Soorah Hud (11): 112]
In this noble verse, the correct Manhaj to perform worship has been mentioned, which is to adhere to moderation without negligence or extremism – and according to the legislation, 'as you are commanded.'
Allah reinforced the above with His Saying, "and transgress not (Allah's legal limits)." Transgression is to go beyond bounds due to harshness and stubbornness and this is exaggeration.
Three Companions of Allah's Messenger considered their deeds insignificant, one of them said, 'I will fast and not break my fast.' And another said, 'I will pray and not sleep.' And the third said, 'I will not marry women.' The Prophet said, 'As for me then I fast and break my fast and I marry women so whoever turns away from my Sunnah is not from me.' [Agreed upon]