Rope training has been around as early as the 1800s. Randy Hetrick, a former
Navy Seal and
Stanford MBA graduate, developed the Total Resistance eXercise (TRX) equipment and the associated Suspension Training bodyweight exercises in the 1990s, and started marketing it in 2005. Kurt Dasbach, a former professional soccer player in Chile, developed a rival product, Inkaflexx. Inkaflexx has since closed shop, but TRX continues as a $60 million per year business. In 2008, ex
Bristol City F.C. fitness coaching team Mark Hammond and Pete Faulkner developed the FKPro two-strap system. In 2009 Fabio Martella MMA coaching wrote the first TRX technical manual in Italy. Another alternative is the aeroSling ELITE made in Germany. This "Suspended Pulley Trainer" also contains a pulley system. The Hook Isometrics/Suspension Trainer by Sierra Exercise Equipment enables the user to use it for either suspension training or isometrics training. Evolution has continued with TRX and other companies improving designs to minimize risk. ==Benefits and criticism==