Boost is a story about some children that had enhancements from a clinic and how they behaved in class. When children read this, they could tell that this was cheating and that it wasn't fair on others. For extended reading texts, I found articles online based on doping in sport.
Mighty Muscles is a short article that gives students a brief idea of why it is important to have healthy muscles. From observations, few children knew only one or two muscles in their body. For extended readings, I've had to search online to find articles and readings that related to the muscular system.
The follow up activities were based on agree/ disagree, compare and contrast and short fact presentations. Some children made advertisements about Boost and whether people should be using it or not. Check out an example here. Here's are movies made by students about the Zika Virus here and here. Here's an activity for Mighty Muscles here.