Resistance/Strength training

Strength training works through mechanical, neurological, and metabolic pathways. Mechanical tension from resistance creates micro-tears in muscle fibers, triggering cellular signaling (such as the mTOR pathway) to synthesize new proteins and increase muscle mass. Neurologically, it improves the efficiency of the nervous system in recruiting motor units and increases neuronal firing rates. Metabolically, muscle tissue acts as a 'glucose sink,' improving insulin sensitivity and increasing the resting metabolic rate. Additionally, the mechanical loading of bones stimulates osteoblast activity to increase bone mineral density, while the release of myokines and neurotrophic factors like BDNF supports brain health and systemic anti-inflammatory effects.

Frequency: Engage in resistance training at least 2 non-consecutive days per week for all major muscle groups to meet ACSM and longevity guidelines. Progressive Overload: Gradually increase resistance, volume, or intensity—typically by 2-10%—once the current load can be performed for two repetitions beyond the target rep count. Intensity: Aim for a repetition range of 8-12 for healthy adults, or 10-15 for older individuals, at an intensity that reaches near-failure by the end of each set. Compound Movements: Prioritize multi-joint exercises like squats, deadlifts, and presses for maximum functional and hormonal benefit. Recovery: Allow 48-72 hours of rest between sessions for the same muscle group to facilitate cellular repair and growth. Longevity Focus: For maximum benefit, pair strength training with at least 150 minutes of moderate aerobic activity weekly to achieve up to a 30% reduction in all-cause mortality (JAMA Network Open, 2024; Nature, 2024).