Is it permissible to fast the vowed days consecutively instead of fasting them on Mondays and Thursdays?

The conditional vow is disliked, but it must be fulfilled if the condition it was tied to occurs, because of the Almighty's saying: "And let them fulfill their vows," and because of the Prophet's (peace be upon him) saying: "Whoever vows to obey Allah, let him obey Him." Therefore, one must fast every Monday and Thursday for a month, and nothing else will suffice because they were specified.