Podcast Summary: This Is So Awkward
Episode: Weightlifting + Cross Training in Teens
Hosts: Dr. Cara Natterson (A) and Vanessa Kroll Bennett (B)
Date: January 13, 2026

Overview

This episode tackles the often confusing and sometimes controversial topic of weightlifting and cross training in preteens and teenagers. Dr. Cara Natterson and Vanessa Kroll Bennett provide a research-driven, comprehensive look at the safety, science, and societal pressures around strength training during adolescence. The episode breaks down developmental physiology, injury risks, best practices, and how adults can advocate for healthy habits in youth while navigating the pressures of coaches, peers, and social media.

"The kids aren't flying blind; they're flying in a plane built by influencers and voices that are really not informed by science." – Cara (04:00)

Key Topics and Insights

1. Why This Topic Matters (01:06)

• Both hosts have received repeated questions from parents about whether it's safe for tweens and teens to lift weights.
• There is heightened cultural interest in muscularity, especially among boys, influenced heavily by social media and sometimes unhealthy advice (02:50).
• Adults often lack clear information, leaving both parents and kids confused or misinformed.

2. Teen Growth and Hormones – The Science (05:47–11:07)

• Adolescence is marked by growth spurts, regulated by hormones: growth hormone, estrogen (estradiol), testosterone, and androstenedione.
• IGF-1 (insulin-like growth factor 1) is central to bone lengthening during growth spurts (06:09).
• Growth plates at the end of long bones drive bone growth. Estrogen signals these plates to fuse, ending growth (07:40).
• Injuries affecting growth plates (the physis) can have lasting effects, causing bones to stop growing or to bend (08:55).

"IGF1 promotes cell proliferation and... what's called longitudinal growth—length of the bones, because it basically tells the cells at the growth plates to multiply." – Cara (06:54)

3. Why Teens Are Injury-Prone (10:45–14:07)

• Growth plates are the weakest points and most vulnerable to injury, especially during rapid growth.
• Fast-growing bones become "less resistant to mechanical force" (12:27).
• Sports medicine defines a growth spurt as gaining >2.8 inches/year (overall height) or >1.4 inches/year (leg length), during which cartilage is even weaker.

"When you're in a really fast growth spurt, a mechanical force—a really hard fall, trauma... a rapidly growing bone is less resistant to that trauma." – Cara (13:11)

4. Common Adolescent Injuries (17:58–26:13)

• Osgood Schlatter (knee): Ligament pulls bone during fast growth, causing a bump below knee (19:01).
• Sever's Disease: Apophysitis (inflammation) at heel's growth center (22:57).
• Slipped Capital Femoral Epiphysis (SCFE, hip): Ball at top of femur slips due to stress on growth plate (25:10).
• Distal radial fractures (wrist): Common from falls, especially when growth plates are still open.

"It's like your puberty memento." – Vanessa, about the persistent Osgood Schlatter bump (21:16)

5. Is Weightlifting Safe for Teens? (26:48–33:51)

Resistance Training vs. Weightlifting

• The proper scientific term is "resistance training," which is safe even for children as young as five, so long as only body weight is used (27:11).
• Body weight exercises (push-ups, planks, crab walks, etc.) are highly recommended and encouraged regardless of age.

"There is no data that it is ever unsafe to resist your own body weight." – Cara (29:48)

Formal Weightlifting

• Technique should be learned first with no weights, e.g., with a wooden dowel.
• Heavy lifting (maximal lifts, powerlifting, bodybuilding) is not recommended until bone growth is complete and growth plates are fused (33:27).
• Adolescents should avoid maximal lifts and competitive powerlifting/bodybuilding.

"Maximal lifts, powerlifting, and bodybuilding are not recommended for skeletally immature athletes." – Cara (33:35)

6. Social and Emotional Pressures (33:51–36:38)

• Boys especially feel immense pressure to "get big"—for attractiveness, social belonging, and self-worth.
• Coaches often push teens into weightlifting early, intensifying this pressure (36:43).

"There is a tremendous pressure... I have to get big. People aren't going to find me attractive. If I'm not big, I'm not going to be part of the friend group I want to be friends with. If I'm not big, no one's going to be romantically interested in me." – Vanessa (35:32)

7. How Adults Can Support Teens (38:37–40:33)

• Parents are encouraged to respectfully ask coaches and trainers about their qualifications, curriculum, and attention to age/stage safety.
• Ask: Who is staffing the weight room? What progression is used for beginners? What is the protocol for safe advancement?
• Kids will often minimize risks to keep participating, so adult advocacy is essential.

"It's our job to protect our kids' well-being and prevent injury as best we can." – Vanessa (39:47)

8. The Importance of Cross Training (40:33–46:12)

• Cross training (playing multiple sports, mixing activities) is vital to avoid repetitive stress on developing bones and muscles.
• Single sport specialization, particularly before age 12, leads to increased injury risk and burnout.
  • 59% increased risk of any injury
  • 45% increased risk of overuse injury (46:12)
• Youth should take 2–4 months per year away from a single sport (per medical recommendations).
• Delaying specialization until ages 15–16 supports higher long-term athletic achievement.

"Delaying specialization until you're about 16... you have a higher likelihood of being successful in that sport because you have broader motor skill development, you've cross-trained, and you have less burnout and less injury." – Cara (47:22)

9. Gender Differences in Injury (49:47–51:02)

• Most research has been conducted on male athletes; female athlete-specific data is still emerging.
• Males: More cartilage/growth plate-related injuries; Females: More soft tissue/ACL injuries.
• The rate of ACL injuries is much higher in female athletes, but reasons (including hormonal cycles) are not fully understood.

"So much of the research has looked at the male population that it's very hard to compare male risk versus female risk." – Cara (49:49)

Notable Quotes & Moments

• "Kids aren't flying blind; they're flying in a plane built by influencers and voices that are really not informed by science." – Cara (04:00)
• "Maximal lifts, powerlifting, and bodybuilding are not recommended for skeletally immature athletes." – Cara (33:35)
• "There is no data that it is ever unsafe to resist your own body weight." – Cara (29:48)
• "The pressure for boys to get big is so, so heavy on them psychically." – Vanessa (35:38)
• "It is perfectly within a parent's right to know and understand what training and expertise the adults have who are guiding and teaching kids." – Vanessa (39:47)
• "Delaying specialization until you're about 16... you have a higher likelihood of being successful in that sport." – Cara (47:22)

Timestamps for Key Segments

• [01:06] – Why the hosts chose this topic, its relevance, and research approach
• [05:47] – The hormonal and physiological science of adolescent growth
• [10:45] – Why teens have unique injury vulnerability
• [17:58] – Overview of common adolescent injuries
• [26:48] – Introduction to weightlifting and the resistance training distinction
• [33:51] – The impact of social media and peer pressure
• [38:37] – Guidance for parents on engaging with coaches/instructors
• [40:33] – The importance of cross training and data on overuse injuries
• [49:47] – Gender differences in injury types and the current research gap

Final Thoughts

This episode offers a nuanced, evidence-based perspective on adolescent strength training. Dr. Cara and Vanessa stress bodyweight resistance training as universally safe and beneficial, while warning against early, unsupervised, or maximal weightlifting. Cross training is repeatedly emphasized as critical for both injury prevention and athletic success. The hosts encourage respectful curiosity from parents and open dialogue with kids who may be feeling outside pressure to train in unsafe or unsustainable ways. Ultimately, the science says: focus on form, diversify activity, delay specialization, and prioritize your teen's lifelong health over short-term performance.