Is it permissible to ask God for an increase in height while performing natural exercises for that purpose, and is this considered discontent with God's decree?

If a person is in the growth stage, there is no harm in supplicating for tall stature. This is not considered an transgression in supplication or a lack of contentment with divine decree and destiny. It is permissible to use exercises and medical drugs to increase height at any time, as long as they do not cause harm, according to the Prophet's (peace and blessings be upon him) saying: "There should be no harm nor reciprocating harm." A Muslim's greatest concern should be to improve their character and inner self, as the Prophet (peace and blessings be upon him) said: "O Allah, You have made my physical creation good, so make my moral character good too."