Database
[{"_id":"634c0777427df2a5adc17b4c","title":"PROGRAMME TEST","user":{"name":"Jérémy","email":"dubar.jeremy@gmail.com","profilPicture":"google.fr"},"exercices":[{"exercice":"6349563c2e0df123096b7feb","totalSet":1,"rest":"1"},{"exercice":"634956452e0df123096b7fed","totalSet":2,"rest":"2"}]}]
Query
db.collection.update({_id:"634c0777427df2a5adc17b4c","exercices.exercice":"6349563c2e0df123096b7feb"},{$push:{"exercices.$.result":{set:1,kilogram:"10"}}})