How to train leg strength on a smart trainer: exercises and tips

Training on indoor trainers is an indoor option increasingly popular among cyclists, not only to maintain fitness when riding outdoors isn't possible, but also to develop specific qualities. One above all: leg strength.

Although trainers are mainly used for aerobic training, the right strategies let you stimulate your ability to apply maximum pressure on the pedals, significantly improving neuromuscular coordination and, as a result, increasing absolute power.

The real, unmatched advantage of this practice lies in total control of the training environment. On the road, unpredictable factors such as traffic, traffic lights, descents, wind or rough tarmac constantly break your rhythm. Indoor training, by contrast, removes every external interference, offering a "laboratory environment" where every variable of the exercise can be isolated and managed with absolute precision. It is precisely this uninterrupted consistency that makes strength work on the trainer so remarkably effective.
 

The benefits of strength training on the smart trainer

One key study compared performance on smart trainers and rollers in a 10 km time trial, and found that smart trainers improve pedal stroke quality and neuromuscular stabilisation to a greater extent, precisely because you need to maintain dynamic balance.

Integrating high-intensity sessions on the smart trainer with all-out sprints increases maximum leg strength and improves pedalling economy.

A simple and effective example is using 6–8 second sprints on a smart trainer with progressive resistance, repeated with long recovery periods.

Riding on the smart trainer requires greater activation of the stabiliser muscles. This leads to significant involvement of the core and the lower limbs, especially the hip and knee extensor muscles.

Training on the smart trainer also improves coordination between the postural muscles of the back and the propulsive muscles of the legs, thereby optimising force application on the bike.
 

You won’t “bulk up”

When talking about strength, many cyclists think it means becoming bigger and slower. Nothing could be further from the truth.

The most significant adaptation on the smart trainer is neuromuscular: it improves inter-muscular coordination during the pedal stroke, even without a direct increase in muscle mass.
 

During trainer sessions, the legs and core do most of the work, with particular involvement of:

• Quadriceps: they are mainly activated in the push phase, when the knee extends and the pedal is driven downwards.
• Glutes: they come into play when pushing hard on the pedal, contributing to hip extension and power production.
• Hamstrings: they take part in the pedal stroke by helping control the leg's movement and making the motion smoother.
• Calves: they work through the ankle movement and help transfer force all the way to the pedal.
• Core: abdominal and trunk muscles engage to stabilise the body and maintain an efficient position, especially as effort intensity increases.

Training, therefore, does not only improve leg strength and endurance: it can also improve the way the different muscle groups work together, making your push on the pedals more effective.

To train strength on the trainer, we can mainly work on resistance and effort intensity. Depending on how we combine them, we can create different exercises, such as low-cadence efforts or maximal sprints. Let's look at them in detail.

Simulated SFR (strength-endurance climbs)

SFR efforts don't train strength in the strictest sense, but they can be used to improve your ability to sustain intense efforts even as fatigue builds, a particularly useful quality on climbs.

To use this strategy, choose a trainer with adjustable resistance, such as the Avanti smart trainer, and select a resistance that lets you hold a cadence of around 40-50 rpm at a high level of effort.

You can do 3-6 minute intervals, followed by 3-5 minutes of recovery at an easy cadence, for a total of 3-5 repetitions.
 

Standing-start maximal sprints

Standing-start maximal sprints help improve your muscles' ability to activate and work together quickly, allowing you to express a lot of force in a short time.

This ability is especially important when relaunching the pace, attacking and changing rhythm. Sprints also heavily involve fast-twitch muscle fibres, the ones we mainly use during the most explosive efforts and which tend to lose efficiency with age.

For this exercise you can use a trainer such as Justo 2 and set a high resistance. Starting from a standstill or a very low cadence, push at maximum intensity for 6-8 seconds.

Recover with very easy pedalling for 2-3 minutes, then repeat the exercise for a total of 8-10 times.
 

Some useful tips for your workouts

When working on strength, recovery matters as much as training. High-resistance sessions and intense sprints take time to be properly absorbed by muscles and joints.

It's therefore best to avoid scheduling two hard sessions on consecutive days and, whenever possible, leave at least 48 hours between sessions.

You still need the iron

Trainer work can also be combined with a traditional weight-training session. Exercises such as squats, lunges or deadlifts let you train strength with different stimuli from those of the bike.

The advantage lies precisely in the combination: in the gym you build strength, while on the trainer you work on applying it effectively to your pedal stroke. Including at least one weekly weights session, well coordinated with the rest of your programme, can make your preparation more complete and also help prevent injuries.

Can you really train leg strength on a trainer?

Yes. Trainers let you perform workouts with a high force demand on the pedals through sprints, low cadence, resistance and simulated climbs. It is important, however, to distinguish these exercises from maximal strength training with weights: they are different stimuli that can be used together within your preparation.

How many times a week should you train strength on the trainer?

It depends on your fitness level and the rest of your programme. Generally, one or two sessions a week can be enough. It's important to allow proper recovery between the hardest workouts and avoid packing too many demanding sessions into a few days.

Which trainer should you choose to train strength?

For strength workouts, it helps to choose a smart trainer able to handle high resistance and rapid changes in intensity, so you can work well both at low cadence and in sprints.