Why 'body type' training advice deserves some skepticism
Rigid body-typing systems (ectomorph, mesomorph, endomorph) are considerably oversimplified compared to actual human variation — useful as a loose starting framework, but not a precise, deterministic guide to training choices.
What actually matters more than body type
Current fitness level, any joint or injury history, personal enjoyment, and specific goals matter considerably more for choosing a training style than a rough body-type category.
Working with existing joint sensitivities
Someone with knee sensitivity might favor swimming or cycling over running; someone with shoulder issues might modify certain pressing movements — individual physical history matters more than any generalized body-type framework.
The most reliable indicator: genuine enjoyment
The training style someone actually enjoys and will consistently show up for tends to produce better long-term results than a theoretically 'optimal' style chosen based on body type but genuinely disliked.