The excellent Carlo Parisi, whom I only recently met while in the Czech Republic, is well-known for his intriguing videos. Whether one agrees with his conclusions or not he gets one thinking, gets people talking, and asks a lot of the questions that need to be asked. In his latest post he tackles the issue of s2000 sabre blades and historical fencing—does using the Olympic weight weapon adversely affect one’s practice?
What it comes down to is technique, to how we use that stick or in this case Olympic sabre (an extremely light, flexible stick). It’s not that there aren’t problems with the s2000, because there are, but in some important ways these can be mitigated through technique. For cons, the blade is way too light and flexible, and allows one to perform actions either impossible or unwise with a blade of suitable historical weight. Worse, it is an easy tool to manipulate for favorable scoring—the example I cite most often is whip-over. The FIE never dealt with this properly and never will. Too many careers have been made via these dubious maneuvers.
The pros, however, are worth considering. I use s2000s myself and have found them useful for historical practice. For one, they are inexpensive compared to trainers designed for period fencing. Where one will spend $200 or more (usually more) for the offerings of Hanwei, Coldsteel, Kvetun, Regenyei, Blackfencer, Darkwood, or Castille, an Olympic sabre can be had for less than $50. Their weight makes them a decent choice for children, especially with a shorter blade, and for those not yet used to the heft of weapons 650g or more (Olympic sabres cannot be more than 500g and these days are never in danger of passing 400). The cost and weight make them ideal for introductory classes.
Carlo’s conclusion, much like my own, is that it doesn’t have to. One can practice “HEMA” just fine with the s2000, just as one can with a stick, synthetic, or some ersatz trainer. After all, in many parts of the world, from Poland to Algeria, from the Georgian highlands to England’s heaths, sticks in one form or another have often served as training tools. Egyptian paintings reveal some of the earliest depictions, though the use of the stick as trainer and weapon obviously predates their tenure. 
Form or Substance
Substance, the tool, can matter, and eventually the historical fencer should spend some time with appropriate weapons for the system they study.  This said, if one lacks historically inspired tools there is plenty one can do with the s2000 until they acquire one. Critical in this is source material, the body of texts, because unless one is working from a living tradition or an offshoot of one, the surviving printed word is all we have to guide us. Fencing is more than the weapon one has in hand—it’s the sum of how one moves, thinks, acts, reacts, and manipulates the weapon in time and space. This is an old concept and universal. We see it in the thought of Fiore dei Liberi (ca. 1410 CE) as well as in many East Asian systems to name only two examples. By definition historical fencing means focus on the sources in some fashion.
For a real-world example I can cite one of my students. He’s a teenager and has worked with me for about three years now. Ninety-nine percent of the time we have used s2000s. The system we spend the most time on is Radaellian sabre which uses the elbow as axis for the rotation of cuts. One doesn’t need to use the elbow to move this weapon, but we do. The s2000 is not weighted properly for it, we’re not trying to avoid our mount or the trooper next to us, and we’re not trying to cut through the shakos or woolen coats of retreating infantrymen. But, this system uses the elbow so we do.
Occasionally I have him try a technique, action, or set of actions with curved sabres copied from original blades, a 16mm weighing 704 and a 20mm of 745g. As he grows stronger we will use these more and more until they are as comfortable for him as the s2000. Significantly, while stamina using heavier weapons is an issue, his technique is not—he doesn’t change what he’s doing, and, he doesn’t have to. This doesn’t mean that the blades move the same way, they don’t, but because his technique is correct the more forward weight of the 16 and 20mm doesn’t trouble him. When he first held one, he noticed the difference, asked about it, and I told him that he will cut the same way. A few minutes of a partner drill with molinelli and he had adjusted.
Practice as You are Able
Carlo’s demonstration in this video highlights the importance of technique. In many of his videos he also shows ingenious ways to work with what one has to hand. What he shows may not work for you, but the creativity, drive, and commitment to study, drill, and practice is something we should all aspire to. If you have Olympic tools and want to work on historical material, grab sources and go for it. Focus on technique, get help if you need it, and have fun.
 Polish youths used wooden trainers in a game called palcaty (cf. https://hroarr.com/article/the-sabers-many-travels-the-origins-of-the-cross-cutting-art/); tahtib and Maghrebi stick fighting in North African nations reflects centuries of similar games or dances meant to impart practical skills; there are photos, accounts, and oral histories that indicate that boys in Khevsureti and other highland areas of Georgia used wooden trainers, for both pari (buckler) and kmali (the longer sword); and well-known in “HEMA” circles English singlestick, once a pastime and popular method of prize-fighting, continues to find many fans.
 In an earlier post, “Piste and Page (Part I)” [15 Jan., 2021] I related the experiments, arguments, and attempts my comrade Jon Tarantino and I made to convince fellow fencers and coaches that a heavier, slightly stiffer, more closely related to historical blades was the answer to the problems plaguing Olympic sabre in the mid-1990s. As we learned then, and as most historical fencers know, using weapons of period weight and handling provides insights that are sometimes hard to appreciate if one only uses one style of weapon. As much as one can do with the s2000, it doesn’t give one a feel for the more forward weight of cavalry sabres or the more back-weighted heft of an Insular broadswords.