Spark's minutes targets are based on how many days and minutes you said you were prepared to work out when you entered your Exercise Goals (although it defaults to 3 x 30 = 90 minutes if you don't enter anything). If this no longer reflects your workout patterns, then update your Exercise Goals (accessible through the LH side of the Start page).
Spark has to cater for a fairly wide range of fitness levels, so the intensity levels (ie. how many calories you burn in a minute) tend to be fairly moderate. Working out at a greater intensity than that is actually a good thing - it gives you more health and fitness benefits.
So you should be setting both a minutes target, and a calories target that reflects your normal workout patterns. Just set these two targets independently, rather than using Spark's intensity assumptions.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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