Difference between "be helpful to" and "be helpful for"
I've seen sentences with either like:

What kind of information from consumers is most helpful to you?

I hope this series on running footwear has been helpful for you.

So what's the difference?

Question

Difference between "be helpful to" and "be helpful for"
I've seen sentences with either like:

What kind of information from consumers is most helpful to you?

I hope this series on running footwear has been helpful for you.

So what's the difference?

Answer

General rule:  helpful FOR a purpose/benefit or helpful TO a person.  (my opinion)

Answer

It would be helpful for you to workout.
Means helpful for somebody to do something. (Helpful for you- Enables you to get fit)
Helpful to somebody - The booklet is helpful to parents of the disabled boy. (Helpful to you means if you willing to help)

Answer

Not much difference in meaning at all. I'd say the first sentence using "to" is more correct.