Rest has a positive impact on a health.
Relaxation is a prerequisite to rest and good sleep.
Relaxation is a prerequisite to that which has a positive impact on health.
Relaxation is a prerequisite to that which has a what impact on health?
[1] terrible
[2] survive
[3] mild
[4] positive
[5] negligible
[6] negative
[7] sweating
[8] exercise