If you'd like something "out-of-the-box" so to speak, with a minimal amount of development from the wireless perspective, there is a product called
GFIT which is a wireless module which does automatic encoding/decoding of ANT+ and BLE data for Fitness Equipment.
You can use it as either a network processor controlled by a host processor, or as a standalone host processor.
This doesn't include development effort for the trainer hardware, electronics, software, etc, but hopefully it's enough to get you started.