Struggling to Balance Running and Cycling Training – How to Optimize the Use of Data from Intervals.icu for Both?

Hey everyone, I’ve been using Intervals.icu for a while now to track my running and cycling workouts, and I’m really happy with how it helps me organize my training data. Lately, though, I’ve hit a bit of a wall trying to figure out how best to balance both sports in my training plan, especially when the metrics for each seem to pull me in different directions. I’m sure I’m not the only one dealing with this, so I figured I’d reach out to the community to get some advice.

A bit of background: I’ve been a cyclist for a few years and only recently got more serious about running. I’ve noticed that when I’m pushing hard on the bike, my running performance suffers, and vice versa. For example, after a long, intense bike session, my legs feel like they’re dragging during my runs for the next few days. I feel like I’m not recovering properly between workouts, but at the same time, I don’t want to cut back on either sport because I enjoy both. I’m wondering if anyone else has run into similar issues and how they’ve managed to use the data from Intervals.icu to strike a balance between these two types of endurance training.

One thing that’s stood out to me is how different the metrics are between cycling and running. On the bike, I feel like I have a pretty good understanding of how to pace myself using power data, but when it comes to running, I’m less sure of what metrics to focus on. I’ve been tracking my heart rate, pace, and running power, but I’m not sure I’m interpreting the data as effectively as I could be. Should I be focusing more on heart rate zones when it comes to running, or is running power just as valuable? It seems like my running performance is much more sensitive to fatigue than my cycling, so I’m wondering if I need to adjust my running workouts more based on recovery indicators.

I was particularly inspired by the way Intervals.icu helps me analyze my running tracker data. An online fitness running performance tracker is a tool designed to monitor and evaluate various metrics related to running. It allows athletes like myself to track improvements and identify potential areas for optimization. With such trackers, I can see patterns in my fatigue levels and performance dips, which helps me adjust my training accordingly.

It’s given me insights into how fatigue from running differs from cycling and how the recovery periods might need to be adjusted based on the intensity of each workout. I noticed that after following the fatigue graphs and tracking how my body responds, I can predict when my running performance is about to dip. This has been a positive turning point for me, as I’m now considering shifting my focus more towards using these recovery indicators to better balance the two sports.

One thing I’m thinking of experimenting with is alternating between heavier weeks of cycling and lighter weeks of running, and then flipping the intensity the following week. I’m also considering adjusting my running sessions to be more recovery-based during weeks where my cycling volume is high. But I’m curious if anyone else has tried a similar approach and whether it helped avoid burnout or overtraining. Did you find that your running performance improved when you spaced out your high-intensity workouts for both sports, or did you stick to a more balanced intensity for both throughout the week?

Another challenge I’m facing is using Intervals.icu’s performance tracking to manage my fatigue across both sports. I’ve been trying to use the fitness/fatigue chart to keep track of how much stress I’m putting on my body, but I’m not sure if I should be interpreting the data differently for running versus cycling. The fitness curves seem to respond differently depending on which sport I’m focusing on, and I’m worried I’m not resting enough between sessions, even if the data suggests I should be fine.

I’d really appreciate hearing about how others have used Intervals.icu to fine-tune their approach to training for multiple endurance sports. Do you focus more on power or heart rate? How do you use the fatigue data to inform your training load for both running and cycling? And if you’ve found a way to balance both sports without sacrificing performance in either, I’d love to hear about it! Thanks in advance for any advice or tips you can share.

2 Likes

Hi. I also both run and ride. My main focus is definitely cycling though.

For cycling, I focus entirely on power, cadence, using terrain to gain speed and work the proper zones for the situation, interval, etc…I really don’t care about HR at all because after many years, HR is pretty much always doing the same thing it always does…and when I use a HR monitor, the HR zone pretty much matches the power zone unless I’m really tired, or really fresh.

Running is entirely HR but I’m not that serious about it…

I do my running on the same days as I do my cycling intervals (Tuesday and Thursday). Saturday’s are usually a hard group ride or a long endurance ride depending on my mood. Sometimes I’ll do a 3rd interval session.

Sunday is either a 3.5 hr endurance ride or sometimes I’ll do another road or MTB group ride. I also do a 20-30 minute run before or after the ride.

Wednesday and Friday are Z2 rides. Monday is a very easy 30 minute spin or no ride at all.

I want my rest or Z2 days to be restful easy so I don’t add running on those days. I suppose I could run instead of riding, but I never do. My usual runs are in the 30 minute range mostly Z2, Z3 and do not really add any noticeable fatigue nor does it affect my ability to complete my workouts whether I run before or after the cycling.

I have no aspirations of being good at running. I enjoy it, and I like burning the extra calories to keep my weight down. I do a few MTB races a year these days, maybe a couple fondo’s or gravel races, but I mainly just train just because the fitter I am, the more fun I have, and I enjoy structure.

Every 3-4 weeks, I do an easier week with about 50% my usual TSS. If I’m just doing base training I’ll go 6 weeks without a rest week.

Hope that helps at all…just what I do and it keeps me motivated and I still see small gains even after a long time training.

2 Likes

I also like to have a combination of cycling sessions and running sessions. In the summer months, it’s mostly mountain biking or trail running, while in the winter months, it’s mostly indoors on the trainer and treadmill. I also find it difficult to balance between the two. And if you also want to include a little bit of strength training in the program, it becomes a bit complicated and hard to align with the family schedule and recovery. I’ve tried using Wahoo System X’s duathlon plan—I’m somewhat satisfied with it. I’ve also tried using System X’s triathlon plan but removed all the swimming sessions.

Last season, I used HumanGo, which is an AI where you can define how much time you have available and what goals you have, and it generates a plan. I entered my desired percentage of running sessions and cycling sessions, and it takes the total load into consideration. It uses all the available data from training watches, like heart rate, HRV, sleep, and your subjective ratings of the sessions. If it detects that you’re overtraining or skipping sessions, it offers to replan. You can also set preferences for which days you want specific types of sessions.

I run using the Stryd footpod, which measures power, so all runs can be regulated by power instead of pace or heart rate—or you can choose to go by heart rate if you prefer. Overall, this makes the training plan easy to follow. In theory, this system is very appealing as it saves you from having to create the plan yourself. HumanGo even has a trial period, so it might be worth trying to see how it works.

2 Likes

Hi, I’m struggling with the same issues… You are not alone… in my case, now in winter, my focus is more on running races but trying not to lose my bike fitness because I’ll compete in some duathlons next spring. My advice for running is to check HR for your Z2 sessions to really do a Z2 trainning… but for interval sessions pay attention only to the pace according to your known threshold pace. In bike I noticed that my HR is lower than running, but this seems to be normal. When I do intervals on the bike I focus on Power only…

In may case, I’d say that the fitness/form/fatigue chart is working well and reflecting what I’m doing in my bike or run workouts. I set the training load for runs based on my HR and for the bake based on my Power.
Anyway, it would be very appreciated if someone could share an example of training for a couple of weeks where the load of both disciplines is the same…
By the way, can someone shares some examples of brick sessions? bike-> run or run->bike…
Thanks

What I struggle with is the load metric - the overall fitness/stress is calculated based on simple sum of running and cycling loads, but based on my subjective feeling of fatigue after different sessions, I feel that the two load metrics are not additive. An hour run of subjectively similar intensity to an hour ride always generates much lower load read.

Is this an issue for anyone else?