The Sales Team Activity Totals Report combines total activities across your whole team so you  get a snap shot of how they are performing. 

Click: Menu>Custom Reports>Report On>Sales Team Activity Breakdown.
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You can filter the report by:
​Phase
Area/Territory
Sales Rep
Account Manager
Activity Status

Sales Team Activity Total Graph

If you'd like to view a breakdown based on user check out the Sales Team Activity Breakdown Report.