When a person stands for takbirat-ul-Ihram or Qira'ah (recitation)...
When a person stands for takbirat-ul-Ihram or Qira'ah (recitation), he should not walk, nor should he incline on one side, and as an obligatory precaution, he should not move his body nor lean on anything in normal condition. However, if he is helpless, and is obligatory to lean on something, there is no harm in it. If while standing, a person forgetfully walks a little, or inclines on one side, or leans on something, there is no harm in it.
When a person is engaged in obligatory Dhikr in the prayer, his body should be still, and, as an obligatory precaution, it applies to Mustahab Dhikr also.And when he wishes to go a little backward or forward, or to move his body a little towards right or left, he should not recite any thing at that time.
If he recites something Mustahab while in motion, for example, if he says Takbir while going into Ruku or Sajdah, his Dhikr will not be correct provided that he has said it with the intention of a Dhikr ordered to be said in prayers, but hisSalat will be valid. Bi-hawli-llahi wa quwwatihi aqumu wa aq'ud should be said in the state of rising. If a person becomes unable to stand while offering prayer, he should sit down, and if he is unable to sit, he should lie down.
However, until his body becomes steady, he should not utter any of the obligatory Dhikr. As long as a person is able to offer pravers standing, he should not sit down. For example, if the body of a person shakes, or moves when he stands, or he is obliged to lean on somthing or to inclinc his body a bit, he should continue to offer prayer standing in whatever manner he can. But, if he cannot stand at all, he should sit upright, and offer prayer in that position.
If a person is offering prayerin a sitting position, and if after reciting Surat-ul-Hamd and other Surah, he is able to stand up and perform Ruku, he should first stand, and then perform Ruku. But, if he cannot do so, he should perform Ruku while sitting. If a person who can stand, fears that owing to standing he will become ill or will be harmed, he can offer prayer in a sitting position and if he fears sitting, he can offer the prayer in a lying posture.
Qira'ah (Reciting the Surat-ul-Hamd and Other Surah of holy Qur'an) In the daily obligatory prayers, one should recite Surat-ul-Hamd in the first and second Rak'ahs, and thereafter one should recite another Surah and on the basis of precaution it should be one complete Surah.