When people have been made to think they have taken caffeine they go through more rigorous training at the workout in the gym, discovered a recent research study.

For the experiment, each of 12 cyclists drank 250ml of fluid containing artificial sweetener and then either caffeine or a placebo before the 30-second trial.
Tests were carried out to measure power, heart rate and the build-up of lactic acid.
The four cyclists who were told they would receive caffeine and were given caffeine showed the highest sprint power.
Source-ANI