The load is the amount of mass that must be overcome to complete a movement. All exercises abide by Newton’s second law of motion, stating that force equals mass multiplied by the acceleration of the movement, or more simply F=ma. Load can be represented by the weight of the implement like a bar, dumbbell, kettlebell, or similar piece of equipment. Load may also be represented by the tension of a band or even bodyweight. When performing an unassisted pull-up one is lifting almost all of their bodyweight. However, when performing a push-up only a percentage of the body mass is actually lifted. Additionally, the tension in a band, based upon the degree to which it is stretched will impact the load placed upon the muscles.
In general, exercises performed using bodyweight would be classified as such, i.e. BW. Exercises incorporating additional load would be recorded using the closest possible representation of the load, i.e. 20 lbs., 10 kgs., blue band, or anything else that makes sense based upon the particular exercise and load selected. The more precise the better.
When choosing the load for an exercise, you want to choose a load that allows you to complete the number of programmed repetitions while feeling like you could have done one to two repetitions more. Rarely, for most health or performance goals, do you want to choose a weight that results in complete muscle failure.