Etiquettes and respect for the Quraan

Sitting on a chair and reciting Qur'an

Q: Increasingly persons with little or no pain in the legs are sitting on comfortable sofas at home and on chairs in the Musjid reciting Qur'an as they would read a newspaper. Their excuse being it's not a sin. Is it? How should one sit when reciting Qur'an? What naseehah can be offered to relatives and friends who see no problem sitting on a chair, sometimes with legs stretched out, reciting Qur'an?