How to do a complete fitness assessment: step by step

By PounceFit Team · Updated on 2026-10-06

Technical content for health and fitness professionals. It reproduces formulas and protocols published in the scientific literature, with the sources at the end of the page. It is not a recommendation and does not replace the judgment of the professional who runs the assessment.

A complete fitness assessment follows a fixed order: screening and health history, basic measurements (weight and height), body composition by skinfolds or bioimpedance, circumferences, resting measurements and tests, recording and, finally, reassessment under the same conditions. The ACSM screening looks at activity level, known signs, symptoms and disease, and the intended exercise intensity (Riebe et al., 2015); measurements follow published standards such as those of ISAK (Stewart et al., 2011). The value of an assessment lies in being able to compare it with the next one.

1. Screening and health history

The ACSM preparticipation screening aims to identify people at higher risk of a cardiovascular event during exercise. Since 2015, it rests on three factors (Riebe et al., 2015):

1. The client's current level of physical activity.
2. The presence of signs or symptoms, or of known cardiovascular, metabolic or renal disease.
3. The desired exercise intensity.

In the health history, the professional also records the client's goal and anything that may affect the measurements. For bioimpedance, ESPEN asks to record metal implants, pacemakers or defibrillators and, for women, the menstrual cycle phase (Kyle et al., 2004, part II).

2. Weight and height

Weight and height go into almost every body composition calculation. Measure both on the spot instead of using the values the client reports: ESPEN asks for height to the nearest 0.5 cm and weight to the nearest 0.1 kg, and considers self-reported values not valid (Kyle et al., 2004, part II).

3. Body composition: skinfolds or bioimpedance

Choose one method and keep it for reassessments. The differences between the two are covered in bioimpedance vs skinfolds.

Skinfolds. Choose the protocol to fit the client. The Jackson and Pollock equations, for example, came from general-population adults (Jackson and Pollock, 1978). Measure on the right side, take at least two measurements per site, in rotation, and use the mean (ACSM, 2021). The calculation is laid out step by step in how to calculate body fat with calipers.

Bioimpedance. Follow the ESPEN conditions: fasting, empty bladder, no prior exercise and the same time of day for repeated measurements (Kyle et al., 2004, part II). See are bioimpedance scales accurate?

With the body fat percentage in hand, the result can be read against reference ranges such as the ideal body fat percentage by sex and age.

4. Circumferences

Measure with a flexible, non-stretch tape, perpendicular to the segment, without indenting the skin, at the ISAK sites (Stewart et al., 2011). The waist has more than one standard: the WHO measures midway between the lowest rib and the iliac crest (WHO, 2011), and ISAK at the narrowest point (Stewart et al., 2011). Note which one you used. Details in body circumferences.

5. Resting measurements and tests

Depending on the goal, the assessment includes resting heart rate and blood pressure, and strength and aerobic capacity tests. See maximum heart rate and heart rate reserve, estimating 1RM and VO₂max field tests.

6. Recording

Write everything down so that the next assessment can repeat it: skinfold protocol, device, side measured, time of day and client condition. A printable body assessment form helps keep the same order at every assessment.

7. Reassessment

A reassessment only shows the client's change if it repeats the conditions of the first: the same method, the same assessor, the same caliper or scale and, for bioimpedance, the same time of day (Heyward and Wagner, 2004; Kyle et al., 2004, part II).

Small differences may be measurement error alone. For bioimpedance, ESPEN considers the assessment of changes smaller than 1.5 to 2 kg limited (Kyle et al., 2004, part II). For circumferences and skinfolds, each assessor has their own technical error of measurement, calculated from repeated measurements (Stewart et al., 2011).

The complete assessment in PounceFit

PounceFit, the body assessment software, follows this order in tabs: anthropometry, circumferences, skinfolds or scale, blood pressure and heart rate, strength, lab tests and photos (front, back and both sides). The client record holds sex, date of birth, ethnicity, height, notes and goal. When the assessment is finished, the app lists what is missing, calculates the result, produces the PDF report and creates the reminder for the next assessment; the Compare screen shows two assessments side by side.

For day-to-day practice, see body assessment for personal trainers and body assessment for dietitians.