Final answer:
Your belief in your ability to accomplish something is called self-efficacy. Measuring progress requires establishing criteria to evaluate achievement. Physical measurements, such as weight, carry some uncertainty and may require testing for accuracy.
Step-by-step explanation:
The belief in your ability to accomplish something is known as self-efficacy. This concept is relevant to fields such as psychology and health, particularly when discussing motivation and behavior change. The options provided (using special technology to weigh your muscles, determining how much weight you can lift, determining how long you can run, measuring the size of your muscle) are related to physical assessments and do not represent self-efficacy.
To measure progress towards achievement, one needs to establish criteria. This might involve asking, 'How will I know when it is accomplished?'. For instance, a personal trainer tracking the progress of a client's weight lifting program by recording the actual maximum weights lifted and comparing it to her expectations is a practical application of measuring progress.
When measuring physical characteristics such as weight, there is always some degree of uncertainty involved. For example, a bathroom scale that claims to identify any weight within a pound might not be completely accurate, and a test would be necessary to confirm its precision.