Currently doing a four day split of heavy compounds, the other days are rest, or more correctly active recovery.
You don't grow muscles while training, you grow muscles while recovering, pretty stuffed after a week of heavy compounds, squats today then I get to rest/recover for two days before hitting it up again on Monday.
Two days of rest and active recovery, Wednesday is also rest and active recovery.
By active recovery I mean light cardio, ie moving your body, walking erm sorry hiking, bike riding being the most common.
Here is an example of an active recovery day, don't have any interest in a full body workout at this stage: