Weak Glutes and Knee Pain: What the Research Shows
Weak glutes and knee pain can occur together without proving cause. Compare prospective risk research, hip and knee exercise trials and a newer strength-outcome review.
Chris Pruitt
Chris Pruitt is a certified ASFA personal trainer and the founder of WorkoutHealthy, a fitness equipment retailer serving customers since 2007. He has more than 16 years in the fitness business, and he writes and fact checks everything published on Insider.
Metformin and Exercise: What Workout Studies Show
Metformin can interact with exercise, but muscle mass, strength, aerobic fitness and glucose are different outcomes. Compare human studies and prepare useful questions for your clinician.
Knattleikr: What the Icelandic Sagas Reveal About the Ball Game
Knattleikr appears in several Icelandic sagas. Compare what the primary passages actually say about bats, balls, ice and organized play, and see where the rules remain unknown.
Emma Willis Has Trained for Strength for Years, but the Diet Claims Need Context
Emma Willis’s documented routine includes strength-based training, boxing, and Pilates, while viral claims about an aggressive diet need a reality check.
Arnold Is Right That Soy Can Build Muscle, but the 43-Trial Claim Needs Precision
Soy can support muscle and strength gains, but the viral 43-trial claim combines several protein sources and leaves out important limits in the evidence.
Eleven Days on a Bike That Went Nowhere: The 277-Hour World Record
Ben Miles rode a stationary bike for 277 hours, 20 minutes, and 30 seconds in Mallorca, a Guinness World Record still standing today. Here is what multi-day endurance research says about sleep, pacing, fueling, and saddle injury risk at that scale.
225 Pounds, 107 Reps: Jason Faulkner’s Smith Machine Bench Record
On September 5, 2013, Jason Faulkner pressed 225 pounds for 107 decline bench reps on a Smith machine, a RecordSetter category record. Here is what RecordSetter actually is, how a fixed bar path and decline angle change what the lift tests, and what the research says about training toward high-rep pressing.
90 Leg Presses at 750 Pounds: Bruce Klein’s Senior Record at 73
Bruce Klein leg pressed 750 pounds for 90 reps in one minute at age 73, a RecordSetter senior division mark set in 2016. Here is what was independently verified, what kind of record RecordSetter actually hands out, and what the research says about high rep leg press training after 70.
What a Bench Shirt Actually Does: Blaine Sumner’s 885-Pound World Record Bench Press
Blaine Sumner benched 885 pounds in single-ply gear at the 2016 Arnold. Here is what a bench shirt actually does, how his own record kept climbing, and why Jimmy Kolb's much heavier multi-ply lifts are a genuinely different category, not a straightforward beat of Sumner's mark.
Did Eugen Sandow Alternate Easy and Hard Days? What Periodization Shows
Eugen Sandow is often credited with rotating light and heavy training days. We checked his 1897 book and the research on periodization.