What is the opinion of Reddit about the
Developing Endurance (NSCA Sport Performance)?

Developing Endurance (NSCA Sport Performance) https://www.amazon.com/dp/0736083278/ref=cm_sw_r_apan_glt_fabc_8QDF4Y09CBBYE129Q5EG

This book has a whole section on exactly what you’re asking and all of the benefits associated with resistance training for endurance athletes. You will be hard pressed these days to find an elite endurance athlete who doesn’t resistance train. It’s pretty common in the strength and conditioning world.