The 40 Strong Challenge Similar to 75 Hard, but a much more doable and realistic challenge for busy adults. Here’s the 6 daily habits: 1. 30 Minutes of Physical Activity 2. Drink 1/2 your weight in ounces of water 3. No alcohol 4. Walk for 15 minutes 5. Personal Development for 15 minutes 6. Eat Healthy - No junk food Starts today. Who’s in?