The SwimRun tow rope is NOT used by everybody during races. AND of those that DO use one, they use it in different ways! In my experience so far, I estimate that about 60% of SwimRun teams will use a tow rope at some stage during the race.
That's one of the things I love about SwimRun - the flexibility to do a lot of things the way YOU want.
A SwimRun tow rope is also sometimes called a pull cord. It is MOSTLY used during the swimming stages. In most teams, one team member will be a stronger swimmer than the other, while in the running stages they will be more equal. SO a tow rope is a great way of helping teams stay together, AND help the slower swimmer of the team.
A SwimRun tow rope is a length of elasticated cord, usually about 2 meters, with a metal karabiner at each end. The karabiner has a spring-loaded side clip that can be quickly attached and detached from reinforced loops on the wetsuits. The karabiners should be big enough to handle easily with cold hands!
Basically, for each swim leg, the stronger swimmer of the team should attach the tow rope to the back of his suit. The weaker swimmer then attaches the tow rope to the FRONT of their suit. When swimming, the stronger swimmer leads the team, and the weaker swimmer should swim directly behind.
By doing this, the weaker swimmer gets a “tow” from the elasticated cord, and also benefits from “drafting” or “slip-streaming” directly behind the leading swimmer. We have found this works really well.
The lead swimmer barely notices much difference - it’s not like he’s towing a dead weight! Also, the trailing swimmer usually reports that he or she doesn’t feel much of a “tow”. But the team is DEFINITELY faster using a tow rope. Without it, they would have to swim at the pace of the weaker swimmer, and we have tested this and proved that using a tow rope is faster.
We do not use a tow rope for the running legs, as we usually run at the same pace and are equally strong (or weak!) on uphill sections. BUT some Swim Runners DO use a tow rope for the running legs if one member of the team is a noticeably stronger runner than the other.
In this case, the stronger runner will go ahead and lead, with the tow rope clipped into the back of his or her suit. The weaker runner will follow with the tow rope clipped into the front of his/her suit. The team must then run with enough distance between the runners to create a slight tension in the rope.
The weaker runner then has a slight but definite assistance in moving forwards. It’s important that the trailing runner keeps an eye on how far ahead the leading runner is, and tries to maintain a constant slight tension in the elastic tow rope. If the following runner closes the gap with the leading runner too much, the tow rope will become slack and may start trailing on the ground. This could become dangerous, as the following runner may trip over the rope!
On the other hand, the leading runner must be aware of the pace that his team mate is capable of, and try to keep to a speed only just a bit faster - otherwise he could take up almost all of the elastic capacity of the rope and may pull his team mate over! Also, he must keep an ear out for any instructions from the following runner, either to speed up or slow down.
The only way to know if running with a tow rope will be beneficial is for you to try it out several times during training, on different surfaces and at different paces. You may find it to be more trouble than it’s worth if both team members are similar in running ability. BUT if one of you is clearly a better runner than the other, then running with a tow rope may make the team faster and/or reduce running stress on the slow runner in the team.
Here’s how I made a simple tow rope for about 5 dollars! ; -
I bought 2 metres of elastic bungee cord, about 6mm thickness, two karabiners of about 2 inch diameter, and a pack of small plastic zip ties. At each end of the bungee cord, I created a loop so that I had about 6 inches of cord doubled back on itself.
I then used about 8 to 10 zip ties to secure the loop. Here’s a photo.
After securing the loop, I cut off the excess plastic from each zip tie, and then GENTLY melted each zip tie locking point with a SMALL flame on a cigarette lighter. This rounds off the sharp corners on the zip tie, and helps to lock the tie in place.
At first, our home-made elastic tow rope seemed to be a bit too long, and as a temporary measure we just tied a big knot in the middle to shorten the rope.
After a number of training sessions in the sea, however, Mogsy found that she was swimming too near to my feet most of the time - too close for comfort! Also, when her new custom-made wetsuit arrived, the clipping point for the rope was lower than before.
So we simply undid the knot, and the SwimRun tow rope became just about the perfect length. As always, you have to test, test, test these things in training, doing EXACTLY what you would be doing in a race.
Then there will be no awkward surprises on race day!