Fitness in Focus: What are the physicial demands of Enduro racing?
The Enduro World Series visited Scotland during Tweedlove and for the first time I was racing an Enduro of this level. I’ve raced a few enduros over the last 3 or 4 years with varying degrees of seriousness and success. The Enduro World Series is a real test of the all round mountain biker and without being over confident I consider myself to be a competent rider. In XC races, even on the World Cup, I’m a strong descender. However in comparison to the leading downhill and enduro racers my technical skill and downhill ability isn’t as strong, especially when things get steep, corners get tight and ruts get deep.
In terms of physiology and fitness however I felt like I would be one of the stronger riders in the race. Before the race there had been a lot of talk around the previous round in Ireland. The transitions between stages had been very tight and the stages had flat sections with lots of pedalling. This made me wonder what excatly are the physical demands of enduro racing? What kind of training should the aspiring enduro racer do?
Going into the race I fitted a Quarq power meter and rode with a Garmin Edge 500 GPS with heart rate. I also took a GoPro helmet cam to record selected stages. I recorded GPS, power, heart rate and video on day 1 and on day 2 I recorded GPS, Power and video.
Race day 1
Race day 1 is considered a big day for an enduro race. With 4 significant climbs to reach the 4 timed downhill stages over nearly 60 kms, it is a long day on a long travel bike with bike tires. The stage liason times for Tweedlove this year turned out to be quite manageable. Often I was arriving at the stages with around 30–40 minutes to spare. Heart rate and power was relatively low during the liaisons and I was able to use prodominatly my base fitness or aerobic system which I have been training for nearly 15 years for XC racing. With this strong base fitness I was able to arrive at the start of each stage feeling comfortable and relaxed. What I did find in this instance was that it was difficult to get back to a racing mindset for the start of each stage. Something I need to work on as the psychology of Enduro is more similar to downhill racing than cross country.
The race stages were physical though. What is interesting is that you only have a small window of opportunity to get the power down. You could have all the power in the world but if when it comes to deliver it you’re not in an appropriate gear, or you waste your power with wheel spin or poor line choice, you won’t be efficient or fast. Much of the physicality from the stages comes from dynamic movement on the bike through weighting, unweighting and pumping the bike on the trail and through corners. This isn’t measured through the power meter but is clear when looking at heart rate.
Stage 2 of the day was one of my stronger stages. The stage was mostly on the well known downhill tracks at Innerleithen, often used for downhill races. The stage featured some short climbs and a long fireroad sprint though. On average the window of opportunity to get the power down during pedalling was 5–10 seconds and there were only a handful of chances during the stage to do so.
Race Day 2
Day two was a shortened race due to high winds and the weather warnings forcast. Two stages remained including two long climbs during the liaisons. These were once again quite manageable due to start times being spread out. The two stages were very different with one a nearly full downhill stage in deep mud. I had some technical problems during the stage and struggled to keep the bike moving in the deep mud and ruts. I have some work to do technically in this respect.
The final stage was one I was looking forward to. The longest stage of the race with a lot of pedalling and tight trails I know well. I was aiming to max out my effort on the pedalling sections. Unfortunately my heart rate reading is unavailable for this stage, but you can hear from the heavy breathing in the video that I’m working at maximum on the pedalling sections.
What does this all mean?
Looking at the data of the race stages in the first instance it seems a high lactate threshold and aerobic conditioning might not be too important. Pedalling efforts during the race stages is as short at 5 seconds and probably only up to 30 seconds to 1 minute would suggest that these short, high intensity intervals are all an aspiring enduro racer should do. However, what it is easy to miss is that although I personally could cope with the distances and durations of the race my background as an XC/marathon racer helps me here. Not everyone has years of long, aerobic base conditioning to fall back on. Having a big aerobic base means that you are able to cope with the long stages and also recover between each race stage better. You will also last longer during a season if you are fitter, and should be able to cope with more races as well as be able to train harder between those races too.
If you are taking up Enduro racing with no experience of racing at all then you will need to build enough base fitness to ensure you can last not only the race distance but the practice as well. In the three days leading up to the race I rode for around 3 hours each day. Without sufficient aerobic conditioning simply surviving practice, and then recovering to be able to begin the race, would be difficult if not impossible. Aerobic fitness is important for all mountain bikers, even downhill racers, 4x racers and trials riders.
If you are coming into enduro from downhill racing your level of skill, upper body strength, core strength and peak power should be good. However your aerobic endurance and anaerobic power (especially for climbing) could be lacking. Spend some time riding longer distances and aim to cover your typical enduro race distance, including long, steady climbs.
If like me you are coming into enduro from a background in cross country racing it is likely that your aerobic conditioning is sufficient but your level of skill and peak power is lacking. Dynamic movement, body position, weighting and unweighting the bike as well as pumping will be very important. You will also need to develop upper body strength and core stability to be able to manage the higher speeds and forces on the body when cornering and braking. More downhill runs as well as pump track or BMX track sessions can help with this.
It is clear that enduro challenges you physically, mentally and technically. You need to be a smart rider with a good plan of attack for your racing — efficiency and adaptability is key. You need to identify your personal strengths and weaknesses and make a plan to improve. Ultimately without base aerobic fitness you won’t feel fresh enough to race each stage, recover between stages or be able to finish the race. Once your aerobic endurance is sufficient you can work on your peak power and anaerobic fitness. Aside from fitness, skill is a massive factor. To excel at enduro you really need to be a great all round mountain biker.
Rab’s race bike set up
Frame: Santa Cruz Bronson — large
Wheels: Reynolds Black Label 27.5 AM carbon wheels
Suspension: RockShox Pike RC 150 — 75 psi with 2 x tokens, Fox Float CTD Adjust Factory Kashima — 150 psi
Tyres: Schwalbe Magic Mary 2.3 front 24 psi, Maxxis High Roller 2.25 rear 25 psi
Brakes: Shimano SLX 180mm rotor front, 160mm rotor rear
Groupset: Sram X1 groypset with Quarq XX1 power meter (34t chainring)
Stem: Truvativ 50mm
Bar: Renthal Fatbar 760mm, Santa Cruz Palmdale grips
Seatpost: KS Lev Integra 125mm
Saddle: WTB Tweedlove