"Conditioning sessions" refers to a series of exercises or workouts designed to improve strength, endurance, or overall physical fitness. Full definition
If you are doing cardio as well, I'd recommend one to three additional conditioning sessions per week. (sweatlikeapig.com)
Real strength training sessions are going to feel a lot different than pure conditioning sessions. (onnit.com)
Follow with a good deep conditioning session by applying your conditioner and sitting beneath a hooded dryer for at least 20 minutes before rinsing. (curls.biz)