diff --git a/lib/git_stats/git_data/activity.rb b/lib/git_stats/git_data/activity.rb
index 3b9aeca8d..050c97876 100644
--- a/lib/git_stats/git_data/activity.rb
+++ b/lib/git_stats/git_data/activity.rb
@@ -2,17 +2,10 @@ module GitStats
   module GitData
     class Activity
 
-      def add_commit(commit)
-        add_commit_at(commit.date)
-      end
-
-      def add_commit_at(date)
-        self.by_hour[date.hour] += 1
-        self.by_wday[date.wday] += 1
-        self.by_wday_hour[date.wday][date.hour] += 1
-        self.by_month[date.month] += 1
-        self.by_year[date.year] += 1
-        self.by_year_week[date.year][date.cweek] += 1
+      def initialize(commits)
+        commits.values.each do |commit|
+          add_commit(commit)
+        end
       end
 
       def by_hour
@@ -39,6 +32,20 @@ module GitStats
         @by_year_week ||= Hash.new { |h, k| h[k] = Hash.new(0) }
       end
 
+      private
+      def add_commit(commit)
+        add_commit_at(commit.date)
+      end
+
+      def add_commit_at(date)
+        self.by_hour[date.hour] += 1
+        self.by_wday[date.wday] += 1
+        self.by_wday_hour[date.wday][date.hour] += 1
+        self.by_month[date.month] += 1
+        self.by_year[date.year] += 1
+        self.by_year_week[date.year][date.cweek] += 1
+      end
+
     end
   end
 end
\ No newline at end of file
diff --git a/lib/git_stats/git_data/author.rb b/lib/git_stats/git_data/author.rb
index b5c1a63ca..8b3f982bf 100644
--- a/lib/git_stats/git_data/author.rb
+++ b/lib/git_stats/git_data/author.rb
@@ -17,10 +17,7 @@ module GitStats
       end
 
       def activity
-        @activity ||= commits.values.inject(Activity.new) do |activity, commit|
-          activity.add_commit(commit)
-          activity
-        end
+        @activity ||= Activity.new(commits)
       end
 
     end
diff --git a/lib/git_stats/git_data/repo.rb b/lib/git_stats/git_data/repo.rb
index 8cd8272d3..61cb0c98c 100644
--- a/lib/git_stats/git_data/repo.rb
+++ b/lib/git_stats/git_data/repo.rb
@@ -27,10 +27,7 @@ module GitStats
       end
 
       def activity
-        @activity ||= commits.values.inject(Activity.new) do |activity, commit|
-          activity.add_commit(commit)
-          activity
-        end
+        @activity ||= Activity.new(commits)
       end
 
       def project_version