Sand bags and TRX have been both a very valuable tool for strength and conditioning. Video below shows some basic ideas to combine too. Working with a sandbag that is attached to a TRX creates a different way to utilize some of the exercises. This is a great a great way to change up your sandbag and/or TRX routines. If you have a sandbag, TRX, kettlebell and some elastic bands this will allow you to do hundreds of exercises and you won't even need a gym membership. Some of the greatest eastern european athletes I have met used some of the simplest tools and methods to be in world class shape.