diff --git a/assets/css/frontend.css b/assets/css/frontend.css
index 699d05a..81580d8 100644
--- a/assets/css/frontend.css
+++ b/assets/css/frontend.css
@@ -15,11 +15,50 @@
 .mystats-shortcode-container th {
     background-color: #f4f4f4;
 }
+
 .mystats-activity-table td:nth-child(4),
 .mystats-activity-table td:nth-child(5) {
     text-align: right;
 }
 
+/* Styles for the nested details table */
+.mystats-activity-details-row > .mystats-activity-details-cell {
+    padding: 0 !important;
+    border-top: none;
+    border-bottom: 1px solid #ddd;
+}
+
+.mystats-nested-details-table {
+    width: 100%;
+    margin: 0;
+    background-color: #fdfdfd;
+    border: none !important;
+    border-collapse: collapse;
+}
+
+.mystats-nested-details-table th,
+.mystats-nested-details-table td {
+    border: none !important;
+    padding: 6px 12px;
+    text-align: center;
+    font-size: 0.9em;
+    width: 33.33%;
+}
+
+.mystats-nested-details-table th {
+    background-color: transparent;
+    font-weight: normal;
+    color: #777;
+    padding-top: 8px;
+    padding-bottom: 2px;
+}
+
+.mystats-nested-details-table td {
+    font-weight: bold;
+    padding-top: 0;
+    padding-bottom: 8px;
+}
+
 /* Shortcode [moje_statystyki_wpis] */
 .mystat-single-activity-shortcode {
     border: 1px solid #eee;
diff --git a/moje-statystyki.php b/moje-statystyki.php
index 52cd826..d34e161 100644
--- a/moje-statystyki.php
+++ b/moje-statystyki.php
@@ -1915,6 +1915,7 @@ function mystat_shortcode_handler( $atts ) {
                     <th>Data</th>
                     <th>Tytuł</th>
                     <th>Kategoria</th>
+
                     <th>Dystans</th>
                     <th>Czas</th>
                     <th>Sprzęt</th>
@@ -1931,6 +1932,28 @@ function mystat_shortcode_handler( $atts ) {
                             <td><?php echo esc_html( $row->duration ); ?></td>
                             <td><?php echo esc_html( $row->equipment_name ); ?></td>
                         </tr>
+                        <?php if ( $row->avg_speed || $row->avg_heart_rate || $row->avg_cadence ) : ?>
+                        <tr class="mystats-activity-details-row">
+                            <td colspan="6" class="mystats-activity-details-cell">
+                                <table class="mystats-nested-details-table">
+                                    <thead>
+                                        <tr>
+                                            <?php if ($row->avg_speed) echo '<th>Śr. prędkość</th>'; ?>
+                                            <?php if ($row->avg_heart_rate) echo '<th>Śr. tętno</th>'; ?>
+                                            <?php if ($row->avg_cadence) echo '<th>Śr. kadencja</th>'; ?>
+                                        </tr>
+                                    </thead>
+                                    <tbody>
+                                        <tr>
+                                            <?php if ($row->avg_speed) echo '<td>' . number_format( $row->avg_speed, 1, ',', ' ' ) . ' km/h</td>'; ?>
+                                            <?php if ($row->avg_heart_rate) echo '<td>' . $row->avg_heart_rate . ' bpm</td>'; ?>
+                                            <?php if ($row->avg_cadence) echo '<td>' . $row->avg_cadence . ' rpm</td>'; ?>
+                                        </tr>
+                                    </tbody>
+                                </table>
+                            </td>
+                        </tr>
+                        <?php endif; ?>
                     <?php endforeach; ?>
                 <?php else : ?>
                     <tr>