I think of the Force energy as a kind of stamina... you can use it to do some really strong force-pushing or jumping but then you need to 'rest' a bit to recuperate.
For example: Obi Wan and Qui-Gon are able to 'force sprint' away from the droidekas at the start of TPM... but by the end of the film when they are force jumping around on platforms, they are unable to force-sprint through the forcefield gateway things during the final confrontation with Maul... because they are exhausted.