As your relatable fitness, health, and happiness guide, we at Greatist strive to bring our readers amazing content on daily basis. Of course, not all of the best stuff comes from us! In this week’s link roundup, we highlight our favorite can’t-miss videos, articles, and opinions from the interwebz:

The Daily Meal — Sustainable Fish Guide

A basic and straightforward guide to help you buy fish safely and responsibly.

Real Age — Foods to Boost the Immune System

Fight off colds with these immune superstars.

The New York Times — Are Cookbooks Obsolete?

Have apps made those beloved books a thing of the past?

Hunt Gather Love — Is That Chicken Really Free Range?

One blogger's thoughts on free range food.

Catalyst Athletics — Why is the Push-up So Hard?

Deconstructing a classic.

For more great fitness tips, healthy recipes, and inspiration, check out our friends at Greatist.