Something I often see is lunge jumps and/or squat jumps (also referred to interchangeably as jump lunges and jump squats) being shown as great exercises for HIIT training and circuit training, particularly when these styles of training are recommended for weight loss. You may have done these exercises as part of a class, or seen an online video, magazine article or part of a TV show recommending these exercises.
I often disagree with how these exercises are used in these situations though and think that for some people they may have the potential to do more harm than good.