Our background is in helping others to train for their personal physiological goals and of course doing it for ourselves. We also love to travel, so tying in ways to exercise effectively with limited equipment is pretty standard for us. As for the TRX (the brand name) or suspension strap training, it has been around as far back as the 1800s when ropes were used.  In more recent years with the growth of the Total Resistance eXercise (TRX) brand, their use has become more commonplace. TRX was developed by a Navy Seal vet Randy Hetrick when on tour in South East Asia with the Military. After finding his modified parachute strap training system kept getting stolen by his comrades, he realised he may be onto something. At their heart, straps work the same as any form of resistance training does, except you may have to find new ways to achieve muscular overload, such as through high repetitions over time.  In short, strap training (the non branded term) and this TRX total body workout are legit.