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isometric training

Athlete holding a deep wall sit against a concrete wall, thighs parallel to the ground, hands off legs
#86: 100 Wall Sits (One Minute Each)2025ArticlesChallengesStrength & Conditioning

#86: 100 Wall Sits (One Minute Each)

Hold the line literally. This RB100 Challenge calls for 100 wall sits, one minute each, across the month. Legs, lungs,…
Editorial TeamEditorial TeamMarch 27, 20253 min
Athlete training on pull-up bar in gym setting, showing full extension and active shoulders under cinematic lighting
#78: 100 Second Dead Hang for Raw Grip Strength2025ArticlesChallengesStrength & Conditioning

#78: 100 Second Dead Hang for Raw Grip Strength

Hang on for 100 seconds. A deceptively simple challenge that will test your grip, shoulders, and mental toughness under load.
Editorial TeamEditorial TeamMarch 19, 20253 min