"Disposición" could mean either aptitude or willingness; "disposición hacia" suggests aptitude to me.
From the way "área corporal" is used in educational texts it seems to be the language of educational psychology. In other words, I think it refers not to developing the body (through exercise) but to developing an understanding and awareness of the body. What follows this sentence is in line with that: it is about understanding structure (joints), direction of movement, the body in space, posture. These are comments on the progress of a young child (age 6?), and I think the emphasis here will be on psychomotor development.

There are references to "desarrollo del área musical" through music.

"“La estimulación psicomotriz en educación inicial [...]
El desarrollo del área corporal permite que los niños se identifiquen con su propio cuerpo, que se expresen a través de él, que lo utilicen como medio de contacto, sirviendo como base para el desarrollo de otras áreas y el aprendizaje de nociones como delante-atrás, dentro-fuera, arriba-abajo, ya que están referidas a su propio cuerpo”
http://200.23.113.51/pdf/27037.pdf

“Guía con actividades de expresión corporal [...] para desarrollar la psicomotricidad [...]
Reconocer la importancia del desarrollo del área corporal, mediante la socialización, con el fin de que maestros, padres, niños y niñas, para que se logre una relación armónica entre el sus compañeros de aula y con los demás.”
http://dspace.unach.edu.ec/bitstream/51000/3124/2/UNACH-IPG-...

"Body awareness is the internal understanding of where the body is in space."
http://nspt4kids.com/healthtopics-and-conditions-database/bo...

"Body awareness provides children with a perception of the dimensions of their bodies -- the shapes their bodies can make and spaces into which they can fit, what movements their bodies can accomplish and what their body parts actually are. Body awareness relies on tactile and vestibular position senses."
http://www.livestrong.com/article/548037-body-awareness-for-...


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Note added at 2 hrs (2017-06-14 06:06:55 GMT)
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Or "an aptitude for developing body awareness".

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Note added at 3 hrs (2017-06-14 06:42:13 GMT)
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Better "aptitude" rather than "an aptitude".