diff --git a/package.json b/package.json
index 7bbaf0b..d28e1da 100755
--- a/package.json
+++ b/package.json
@@ -9,7 +9,8 @@
     "dev": "nodemon server/server.js",
     "postinstall": "node scripts/generate-certs.js || true",
     "create": "node scripts/generate-certs.js",
-    "test": "jest"
+    "test": "jest",
+    "test:coverage": "jest --coverage"
   },
   "jest": {
     "testEnvironment": "jsdom"
diff --git a/public/calculateActions.js b/public/calculateActions.js
index 0b437d4..efcbe73 100755
--- a/public/calculateActions.js
+++ b/public/calculateActions.js
@@ -320,63 +320,7 @@ function buildFeatureFromCandidates(result, key, title, method, candidates) {
   return feature;
 }
 
-async function calculate() {
-  const result = createAnalysisResult({
-    sourceScript: "calculateActions.js"
-  });
-
-  try {
-    addLog(result, "Starte Berechnung...");
-
-    const { data, headers, rows } = await fetchCSV();
-
-    result.inputs = {
-      source: {
-        filename: data.filename,
-        mtime: data.mtime
-      },
-      headers,
-      rowCount: rows.length
-    };
-
-    addLog(result, `CSV-Daten geladen: ${rows.length} Zeilen, ${headers.length} Spalten.`);
-
-    const getRow = (id, seenBy = null) => {
-      const row = rows.find(r => r.id == id && (seenBy === null || r.seen_by == seenBy));
-      if (row) {
-        addObservation(
-          result,
-          `row-${id}${seenBy !== null ? `-seenBy-${seenBy}` : ""}`,
-          row,
-          seenBy === 3 ? 0.95 : 0.75,
-          [
-            `id=${id}`,
-            seenBy !== null ? `seen_by=${seenBy}` : "seen_by=any"
-          ]
-        );
-      } else {
-        addLog(result, `Zeile nicht gefunden: id=${id}${seenBy !== null ? `, seen_by=${seenBy}` : ""}`, "warn");
-      }
-      return row;
-    };
-
-    const shoulderAxisY = 115;
-    const shoulderAxisZ = 61;
-
-    // Oberarm / shoulder
-    const row243 = getRow(243, 3);
-    const row229 = getRow(229, 3);
-    const row198 = getRow(198, 3);
-    const row197 = getRow(197);
-    const row218 = getRow(218, 3);
-    const row219 = getRow(219, 3);
-    const row226 = getRow(226, 3);
-    const row242 = getRow(242, 3);
-    const row200 = getRow(200, 3);
-    const row204 = getRow(204, 3);
-    const row222 = getRow(222, 3); // Ellbow
-    const row223 = getRow(223, 3); // Lower Arm 
-
+function calculate_angleY(row243, row229, row198, row197, shoulderAxisY, shoulderAxisZ, result) {
     const angleYCandidates = [];
 
     if (row243) {
@@ -388,12 +332,13 @@ async function calculate() {
         valueRad: a1,
         weight: 1
       });
-
+      /*
       angleYCandidates.push({
         source: "row243.roll_deg",
         valueRad: a2,
         weight: 1
       });
+      */
     }
 
     if (row229) {
@@ -463,6 +408,108 @@ async function calculate() {
       );
     }
 
+}
+
+async function calculate() {
+  const result = createAnalysisResult({
+    sourceScript: "calculateActions.js"
+  });
+
+  try {
+    addLog(result, "Starte Berechnung...");
+
+    const { data, headers, rows } = await fetchCSV();
+
+    result.inputs = {
+      source: {
+        filename: data.filename,
+        mtime: data.mtime
+      },
+      headers,
+      rowCount: rows.length
+    };
+
+    addLog(result, `CSV-Daten geladen: ${rows.length} Zeilen, ${headers.length} Spalten.`);
+
+    const getRow = (id, seenBy = null) => {
+      const row = rows.find(r => r.id == id && (seenBy === null || r.seen_by == seenBy));
+      if (row) {
+        addObservation(
+          result,
+          `row-${id}${seenBy !== null ? `-seenBy-${seenBy}` : ""}`,
+          row,
+          seenBy === 3 ? 0.95 : 0.75,
+          [
+            `id=${id}`,
+            seenBy !== null ? `seen_by=${seenBy}` : "seen_by=any"
+          ]
+        );
+      } else {
+        addLog(result, `Zeile nicht gefunden: id=${id}${seenBy !== null ? `, seen_by=${seenBy}` : ""}`, "warn");
+      }
+      return row;
+    };
+
+    const shoulderAxisY = 115;
+    const shoulderAxisZ = 61;
+
+
+    const row200 = getRow(200, 3); // Base
+    const row204 = getRow(204, 3); // Base
+    const row201 = getRow(201, 3); // Base
+
+    
+    const row198 = getRow(198, 3); // Bizeps oben-hinten
+    const row242 = getRow(242, 3); // Bizeps unten
+    const row243 = getRow(243, 3); // Bizeps vorne
+    const row229 = getRow(229, 3); // Bizeps oben
+    const row197 = getRow(197);    // Bizeps Seiten-Abdeckung
+
+    const row222 = getRow(222, 3); // Ellbow
+    const row226 = getRow(226, 3); // Ellbow
+
+    const row223 = getRow(223, 3); // Forearm
+    const row228 = getRow(228, 3); // Forearm
+    const row218 = getRow(218, 3); // Forearm 90°
+    const row219 = getRow(219, 3); // Forearm 90°
+
+    const row212 = getRow(212, 3); // Hand
+
+    
+
+    // Bizeps > Y-Achse der Schulter: angleYCandidates
+    calculate_angleY(row243, row229, row198, row197, shoulderAxisY, shoulderAxisZ, result);
+
+    // Forearm rotation: a axis:
+
+    listForearmID  = [row223, row228, row218, row219];
+    listForearmAngle = [60, 145, -90, -90];
+    addLog(result, "Berechnung der Unterarm-Rotation (a axis) aus x Positionen von Forearm und Ellbogen...");
+    for(let r = 0; r < listForearmID.length; r++){
+      if (listForearmID[r] && (row222 || row226)) {
+        dx = listForearmID[r].x_mm - (row222 ? row222.x_mm : row226.x_mm); 
+        if(dx > 35 || dx < -35){
+          addLog(result, `dx=${dx.toFixed(2)} mm ist zu groß für eine realistische Unterarm-Rotation. Überspringe...`, "warn");
+          continue;
+        }
+        addLog(result, `dx between ${listForearmID[r].id} and Ellbow: ${dx.toFixed(2)} mm results in angle: ${Math.asin(dx / 35)*180/Math.PI}°`);
+        
+        var angleRad = Math.asin(dx / 35) + listForearmAngle[r] * Math.PI / 180
+        if(row222){angleRad = -angleRad }
+        const angleDeg = angleRad * 180 / Math.PI;
+        addLog(result, `(a axis from ${listForearmID[r].id}  with dx ${dx.toFixed(2)} mm: ${angleDeg.toFixed(2)}° = ${angleRad.toFixed(4)} rad ) aus x von ${listForearmID[r].id} und Ellbogen`);
+      
+
+        addCalculation(result, {
+            type: "forearmrotationAFromX",
+            input: {
+              dx,
+              r
+            }
+        });
+      }
+    }
+
     // Unterarm / z
     const angleZCandidates = [];