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Cycling Weekly sports and exercise scientist Andy says one hour indoors should not be treated as equivalent to 90 minutes outdoors. For winter endurance rides, he suggests options such as cutting a long session by about 25%, splitting it across two rides or adding controlled tempo efforts when time is limited.
Cycling Weekly has published advice for riders moving their training indoors as colder, wetter weather arrives: 60 minutes on a trainer is not automatically equivalent to 90 minutes outside, but cyclists do not need to reproduce every outdoor ride minute for minute. Sports and exercise scientist Andy recommends adapting long rides to an athlete’s tolerance and training goals, with options including reducing duration, splitting a session or adding tempo efforts.
Andy rejects the commonly repeated conversion that one indoor hour equals 90 outdoor minutes. He says that, in his experience analysing training files and Training Stress Scores, the relationship is not reliable. TSS estimates training load using ride duration and intensity relative to a rider’s threshold; it does not by itself capture every difference between indoor and outdoor riding.
Indoor riding removes much of the coasting and interruption that can occur on the road, and makes it easier to hold a steady pace. But that does not mean every trainer session creates greater training stress. Andy notes that a controlled indoor Zone 2 ride can avoid the surges and harder efforts that happen on outdoor climbs. Conversely, limited airflow can raise heat strain, while long periods in one position can create discomfort. The physical and mental effects vary between riders.
For an athlete willing to ride for longer indoors, Andy suggests reducing a four-hour outdoor endurance ride to about three hours, a cut of roughly 25%, or dividing the work into two sessions. For someone whose indoor limit is two hours, he outlines an alternative of one hour in Zone 1 followed by three 15-minute tempo efforts, with five minutes of easy riding between efforts. That option raises the session’s intensity rather than matching the original duration.
Adapting Winter Endurance Rides
The advice matters to cyclists trying to maintain endurance training without spending several uninterrupted hours on a stationary bike. A strict outdoor-to-indoor time conversion could lead riders to assume that a shorter session has a fixed, predictable training value. Andy’s guidance instead treats the session as a choice between duration, intensity and practicality, shaped by the rider’s goals and ability to tolerate indoor training.
That distinction is useful because indoor riding changes more than the clock. Riders can control pace and complete efforts efficiently, but heat, sustained saddle pressure and boredom can make a long trainer ride harder to tolerate. A shortened or split ride may be more manageable, while added tempo work changes the nature of the workout. The article does not present these approaches as identical replacements; they are options for managing training when outdoor conditions or indoor limits make the planned ride difficult.
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Why Trainer Rides Feel Different
The guidance appears in Cycling Weekly’s “Ask a Cycling Coach” series, where Andy answers reader questions. The question addressed is how to handle the traditional weekend long ride when winter weather pushes cyclists indoors. The source frames endurance riding as a common part of winter training, while noting that a four-hour session can be a difficult proposition on a trainer.
Andy also distinguishes steady endurance work from sessions built around specific efforts. Shorter interval workouts may transfer indoors more easily because riders can warm up, complete efforts and recover without traffic, junctions or changing road gradients. When a workout depends on performing efforts after fatigue has accumulated, he says he may instead split the ride or add tempo or sweet-spot work before the key efforts to make the legs tired first.
““This is simply not true.””
— Andy, Cycling Weekly sports and exercise scientist
No Fixed Indoor Conversion
The article does not provide a universal formula for converting outdoor ride time into indoor time, nor does it claim that a 25% reduction will suit every cyclist. Its recommendations are coaching guidance rather than a controlled comparison showing that the suggested workouts produce equal fitness outcomes. Riders’ training histories, thresholds, equipment, cooling and goals can differ.
The source also does not specify a single way to measure the extra strain from indoor heat or sustained posture. TSS can describe duration and intensity relative to threshold, but the article notes that the experience of an indoor session includes factors not captured by simply comparing ride times. It remains a coaching decision how to balance those elements for an individual rider.
Choose the Session to Fit
Riders adapting a winter plan can use the article’s options as starting points: shorten a long steady ride by about a quarter, split it into two sessions, or use a more tempo-focused workout when total indoor time is limited. The appropriate choice depends on whether the priority is endurance volume, completing particular efforts or keeping the session manageable.
For workouts where efforts must follow accumulated fatigue, Andy says the plan may need a different adjustment, such as separating rides or adding tempo or sweet-spot work before the main efforts. The source gives no follow-up date or further study; its immediate advice is to tailor the indoor session rather than rely on a fixed minutes-for-minutes exchange.
Key Questions
Does one hour indoors equal 90 minutes outdoors?
No. Andy says that conversion is not a reliable rule. Indoor and outdoor rides differ in pacing, coasting, heat and other conditions, so duration alone does not establish equal training stress.
How much shorter can a long indoor ride be?
For riders comfortable with longer trainer sessions, Andy suggests reducing the duration by about 25%. His example is cutting a four-hour outdoor ride to roughly three hours. He presents this as guidance, not a universal formula.
Can a long ride be split into two sessions?
Yes. Andy suggests splitting a ride when one uninterrupted indoor session is difficult—for example, replacing a four-hour ride with two two-hour sessions.
What can a rider do if they have only two hours indoors?
Andy outlines one hour in Zone 1 followed by three 15-minute tempo efforts, with five minutes of easy riding between efforts. This raises intensity rather than replicating the original long ride exactly.
Why might a long indoor ride feel harder?
Andy points to possible heat strain without adequate airflow, continuous pressure on the saddle, limited changes in position and boredom. How strongly these affect a rider varies.
Source: cyclingweekly.com
