An apparatus comprising: one or more processors, and one or more memories storing instructions, that, when executed by the one or more processors, cause the apparatus to: obtain performance intensity data measured from a user with at least one measurement sensor during a first type of sports and during a second type of sports; and classify the performance intensity data in relation to a plurality of predetermined performance intensity zones, wherein each performance intensity zone is predetermined by a first numerical range for the first type of sports, and a second numerical range for the second type of sports, wherein the first numerical range and the second numerical range are represented with a same specific unit of measure, and the first numerical range is different from the second numerical range; wherein the classification of the performance intensity data means that a continuous data measured during the activity is transformed into classified performance intensity summary data indicating an amount of time spent at each performance intensity zone during the first type of sports and the second type of sports; and compare the classified performance intensity summary data with target values, which provide recommendations in order to achieve a desired training effect, and show the comparison to the user. one or more processors, and one or more memories storing instructions, that, when executed by the one or more processors, cause the apparatus to: obtain performance intensity data measured from a user with at least one measurement sensor during a first type of sports and during a second type of sports; and classify the performance intensity data in relation to a plurality of predetermined performance intensity zones, wherein each performance intensity zone is predetermined by a first numerical range for the first type of sports, and a second numerical range for the second type of sports, wherein the first numerical range and the second numerical range are represented with a same specific unit of measure, and the first numerical range is different from the second numerical range; obtain performance intensity data measured from a user with at least one measurement sensor during a first type of sports and during a second type of sports; and classify the performance intensity data in relation to a plurality of predetermined performance intensity zones, wherein each performance intensity zone is predetermined by a first numerical range for the first type of sports, and a second numerical range for the second type of sports, wherein the first numerical range and the second numerical range are represented with a same specific unit of measure, and the first numerical range is different from the second numerical range; wherein the classification of the performance intensity data means that a continuous data measured during the activity is transformed into classified performance intensity summary data indicating an amount of time spent at each performance intensity zone during the first type of sports and the second type of sports; and compare the classified performance intensity summary data with target values, which provide recommendations in order to achieve a desired training effect, and show the comparison to the user.