You have way more control than you would think when it comes to the effects of your cannabis. The exceptions to this rule are the "Heavy Leaners"....All strains are hybrids these days but some lean hard towards indica type effects while others lean hard towards sativa type effects.

With strains that are , for example, 90% indica / 10% sativa, there is really no escape from eventual couch-lock & vice versa for the sativa dominant strains.

However, a good middle of the road hybrid can achieve a wide range of effects depending when it is harvested.

Here is a handy dandy lil chart to help you out