You should start downloading this table: 
How to measure body parts effectively at the beginning and end of the course
- 1st lesson all measurements, including height and weight (do have a scale to weigh participants in the same place)
- Note: it is very important to personally measure each participant.
- 5th lesson: take again the chest’s measurement
- 6th lesson: circumference of the waist
- 7th lesson: circumference of the buttock
- 8th lesson: length of the back
- 9th lesson:circumference of the thighs
- 10th lesson: circumference of the biceps
- 12th lesson: Make again all measurements, including circumference of the forearm and neck. Evidently, weigh each participant in the same scale that was used at the beginning of the course