Most lifting machines focus on single joint exercises, which fail to improve muscle imbalance and does not burn as many calories as hitting the squat rack or swinging a kettlebell. (businessinsider.com)
Single joint exercises simply focus on the hip by itself without much emphasis on the knee or ankle. (best-leg-exercises.com)
The use of single joint exercises should enable a more targeted and intense muscle building stimulus. (rugbystrengthcoach.com)