doing nothing in-particular with maximum effort.
bill: "what are you gonna do now g"
george:"i figure a bit of restercising is in order"
bill: "don't strain yourself"
An exercise of less intensity performed between another activity of greater intensity.
Between your 25 burpees, restercise with 10 squats and then resume another set of burpees.
LYING ON THE FLOOR rather then DOING chores!
"Timmy was restercising"