1json.body_weight @workout.body_weight
 2json.routine do |routine|
 3  json.id @workout.routine.id
 4  json.name @workout.routine.name
 5end
 6json.exercises @workout.sets.group_by(&:exercise) do |exercise, sets|
 7  json.id exercise.id
 8  json.name exercise.name
 9end
10json.sets @workout.sets do |set|
11  json.partial! 'api/sets/set', set: set
12end