Monitoring accumulated activity

A solution for monitoring accumulated physical activity is disclosed. A method according to the solution comprises: acquiring target accumulation parameters defining a target total amount of physical activity for a user to accumulate within an observation interval, wherein the amount of physical activity is defined in terms of an attribute measurable during the physical activity; distributing the target accumulation parameters into a plurality of subsets in a time domain such that each subset is associated with a time sub-interval and a target accumulation value, wherein the sum of the sub-intervals equals to the observation interval; and monitoring the physical activity of the user during a sub-interval by comparing a measured accumulation of the physical activity with the target accumulation derived from at least the target accumulation value of the sub-interval and by outputting a progress indicator indicating the measured accumulation of the physical activity with respect to the target accumulation.