I came across a site which lists the types of "si" clauses. The one I'm confused with is "si" + present verb. It says the resulting clause will either be in the present, future, or imperative. My question is: can the resulting clause either be present/future? As in, can the two tenses be used interchangeably without changing the meaning of the sentence?
For example:
Si j'ai le temps, je jouerai au frisbee le weekend.
vs.
Si j'ai le temps, je joue au frisbee le weekend.
Do the two sentences have the same meaning? Is one of them grammatically incorrect?