It is narrated from Sayyida Maymunah (may Allah be pleased with her) that when the Prophet (peace and blessings be upon him) performed prostration, he would keep his arms, thighs, and body separate from the ground, so much so that if a young goat wanted to pass underneath, there would be enough space for it to pass.
Hadith Referenceالسنن المأثورة / باب من سمع النداء / 150
Hadith Takhrijصحیح مسلم، الصلاة، باب ما يجمع صفة الصلاة وما يفتتح به الخ، رقم: 496