Youth Strength Training Guidelines (NSCA)

The reference document for strength training in children and adolescents in the United States is the National Strength and Conditioning Association’s position statement, first published in 1985 and updated in 2009. Enter an age to see the general prescription it supports.

The prescription, from Table 1

The statement’s general guidelines table is short and specific:

Variable	Recommendation
Strength exercises	1 to 3 sets of 6 to 15 repetitions, upper and lower body
Power exercises	1 to 3 sets of 3 to 6 repetitions
Frequency	2 to 3 times per week on nonconsecutive days
Load progression	increase gradually, 5 to 10%, as strength improves
Warm-up	5 to 10 minutes of dynamic activity
Cool-down	less intense calisthenics and static stretching

Two items in that table are usually dropped in summaries. The power row is a separate prescription, not a variant of the strength one, and the statement specifies those sets be “performed not to failure” because fatigue destroys the movement quality the exercise exists to train. And the 5 to 10% load increment is the actual progression rule — youth programs fail on load jumps far more often than on set counts.

The frequency has a physiological justification: 2 to 3 sessions on nonconsecutive days allow 48 to 72 hours between sessions. The statement notes that once a week appears suboptimal for building strength in youth, though it may be enough to retain gains already made.

Readiness replaces a birthday

The statement’s own words on the age question:

“Although there is no minimum age requirement at which children can begin resistance training, all participants must be mentally and physically ready to comply with coaching instructions and undergo the stress of a training program. In general, if a child is ready for participation in sport activities (generally age 7 or 8 years), then he or she is ready for some type of resistance training.”

Full detail in what age can kids start lifting weights.

What the evidence says about safety

Seven numbered position statements open the document, and the first is that a properly designed and supervised resistance training program is relatively safe for youth. The rest cover strength and power, cardiovascular risk profile, motor skill performance, resistance to sports-related injury, psychosocial well-being and exercise habits.

On the fear that dominates the topic — growth — the statement is unambiguous: “To date, injury to the growth cartilage has not been reported in any prospective youth resistance training research study. Furthermore, there is no evidence to suggest that resistance training will negatively impact growth and maturation during childhood and adolescence.” The evidence behind that sentence is laid out in is strength training safe for kids.

What the federal guidelines and the AAP add

The Physical Activity Guidelines for Americans place muscle-strengthening activity inside the daily hour children need, on at least 3 days a week, and note that formal weight programs are not usually necessary but “are safe for children if they are properly prescribed and supervised.” The American Academy of Pediatrics revised its own policy statement on the subject in 2020, in a clinical report co-authored by the lead author of the NSCA statement.

The volume side for older youth is in strength training for teens, and the activity context is in physical activity guidelines for children.

This content is informational and does not replace advice from a pediatrician or a strength and conditioning professional qualified to work with youth.