Training Stress Score
TSS
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Frequently asked questions
What TSS per week builds fitness?
Progressive builds of 400-600 TSS/week develop good aerobic fitness. Elite amateur cyclists may handle 700-900+ per week. More important than absolute TSS is consistent progression without excessive acute spikes, which cause overtraining.
Is TSS or hours a better measure of training load?
TSS, because it accounts for intensity. Two 2-hour rides at very different intensities have the same time but wildly different training stress. A 90-minute threshold session scores higher TSS than a 3-hour easy ride.