The Muslim prayer, in Arabic Sulah, has many benefits besides the social and spiritual ones. In the following lines we will condense the findings that an American-French team has reached after they conducted a study on the health benefits of the Muslim Sulah.
Raising the hands to be on line with ear attract the breast muscles and moving the shoulders joints back is also good.
Prostrating body in prayers makes the knob joints moves, especially when you put your hands on your knob pressing it back, this makes blood carrying nourishment pour into them. There is what can be called lubricant liquid between the knob joints. On prostration for long period, this helps this lubricant liquid move between the knob parts thus preventing Arthrose and bones hardening in the long run of time  
Read the following verse and see how the words" We have made their joints strong" comes after the order of " prostrate thyself to Him." So it is clear from the aforementioned verse that the more you prostrate and prostrate yourself, the more bones and joints are protected.

"And part of the night, prostrate thyself to Him; and glorify Him a long night through. (26) As to these, they love the fleeting life, and put away behind them a Day (that will be) hard. (27) It is We Who created them, and We have made their joints strong; but, when We will, We can substitute the like of them by a complete change. (28) This is an admonition: Whosoever will, let him take a (straight) Path to his Lord. "(Chapter:76)

Prostrating during prayers along with putting the forehead in the floor makes the human back be stretched and this spread apart  the backbone vertebras thus being activated and preventing cartilage problems and squeezing them together, a French medical report says

" prostrating oneself is the natural therapy for backbone troubles.

Prayer health benefits
 In prostrating oneself to the ground and putting the hands stretched with your hand palm makes blood gush in the human body and this activate the blood circulation and thus activating the human body. Moreover, the constant pressing on knobs and the pelvic area strengthen them.
Prostrating helps air trapped in the stomach to go out thus relieving the stomach and lessen dilation and restless stomach.
Doctors say that the master gland, a gland located in the forehead between the eye brows, is affected when one prostrate himself to the ground as it is activated when pressed thus activating the other glands that play their role in the health and vitality of the body.
 The between-two-prostration sitting has been proved- after long study in US on the heart diseased- a cure for many of heart troubles. It has been scientifically proved that there is a certain artery that  helps in activating the heart connects  the big toe and the hand long finger that we hold it curved toward the Kibbla during doing prayers and connects them both with he heart