diff --git a/src/main.rs b/src/main.rs
index 3ff3c8c..639de19 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,9 +11,10 @@ mod webhook;
 
 use anyhow::{Context, Result, anyhow};
 use axum::{
-    Router,
+    Json, Router,
     extract::{Path, Query, State},
-    response::Html,
+    http::{HeaderMap, header::ACCEPT},
+    response::{Html, IntoResponse},
     routing::{get, post},
 };
 use chrono::{DateTime, Duration, Utc};
@@ -381,6 +382,44 @@ input[type="datetime-local"] {
   background: #111827;
   color: #f9fafb;
 }
+.row-progress {
+  display: none;
+  height: 6px;
+  width: 220px;
+  max-width: 100%;
+  margin-top: .5rem;
+  border-radius: 4px;
+  background: #374151;
+  overflow: hidden;
+}
+.row-progress.active {
+  display: block;
+}
+.row-progress-bar {
+  height: 100%;
+  width: 30%;
+  border-radius: 4px;
+  background: #2563eb;
+  animation: row-progress-indeterminate 1.1s ease-in-out infinite;
+}
+@keyframes row-progress-indeterminate {
+  0% { margin-left: -30%; }
+  100% { margin-left: 100%; }
+}
+.row-status {
+  margin-top: .3rem;
+  min-height: 1.1em;
+  font-size: .9rem;
+}
+.row-status.ok {
+  color: #4ade80;
+}
+.row-status.error {
+  color: #f87171;
+}
+.activity-row.done {
+  opacity: .6;
+}
 </style>
 </head>
 <body>
@@ -451,7 +490,8 @@ input[type="datetime-local"] {
     if !visible.is_empty() {
         html.push_str(&format!(
             r#"<div class="card">
-<form method="post"
+<form id="import-all-form"
+      method="post"
       action="/sync/{}/import-visible">
 <input type="hidden"
        name="oldest"
@@ -486,7 +526,11 @@ input[type="datetime-local"] {
             .map(|m| format!("{:.1} km", m / 1000.0))
             .unwrap_or_else(|| "—".into());
 
-        html.push_str(r#"<div class="card row">"#);
+        html.push_str(&format!(
+            r#"<div class="card row activity-row" data-athlete-id="{}" data-activity-id="{}">"#,
+            html::escape(&athlete_id),
+            html::escape(&activity.id),
+        ));
 
         html.push_str(&format!(
             r#"<div>
@@ -494,6 +538,8 @@ input[type="datetime-local"] {
 <div class="meta">
 {} · {} · {}
 </div>
+<div class="row-progress"><div class="row-progress-bar"></div></div>
+<div class="row-status small"></div>
 </div>"#,
             html::escape(&activity.name),
             html::escape(&activity.activity_type),
@@ -502,7 +548,8 @@ input[type="datetime-local"] {
         ));
 
         html.push_str(&format!(
-            r#"<form method="post"
+            r#"<form class="import-form"
+                     method="post"
                      action="/sync/{}/activities/{}/import">
 <button class="button"
         type="submit">
@@ -519,6 +566,99 @@ input[type="datetime-local"] {
         r#"<p>
 <a href="/">← Leaderboard</a>
 </p>
+<script>
+async function importActivity(athleteId, activityId, row) {
+  const progress = row.querySelector('.row-progress');
+  const bar = row.querySelector('.row-progress-bar');
+  const status = row.querySelector('.row-status');
+  const button = row.querySelector('.import-form button');
+
+  progress.classList.add('active');
+  status.textContent = '';
+  status.className = 'row-status small';
+  if (button) button.disabled = true;
+
+  try {
+    const url = '/sync/' + encodeURIComponent(athleteId) +
+      '/activities/' + encodeURIComponent(activityId) + '/import';
+    const response = await fetch(url, {
+      method: 'POST',
+      headers: { Accept: 'application/json' },
+    });
+    const data = await response.json().catch(() => ({}));
+
+    if (!response.ok || data.status !== 'ok') {
+      throw new Error(data.message || ('HTTP ' + response.status));
+    }
+
+    progress.classList.remove('active');
+    bar.style.animation = 'none';
+    bar.style.width = '100%';
+
+    const count = typeof data.crossings === 'number' ? data.crossings : null;
+    status.textContent = count === null
+      ? 'Importiert.'
+      : ('Importiert · ' + count + (count === 1 ? ' Übertritt' : ' Übertritte'));
+    status.classList.add('ok');
+
+    row.classList.add('done');
+    if (button) button.remove();
+
+    return true;
+  } catch (error) {
+    progress.classList.remove('active');
+    status.textContent = 'Fehler: ' + error.message;
+    status.classList.add('error');
+    if (button) button.disabled = false;
+
+    return false;
+  }
+}
+
+document.querySelectorAll('.activity-row .import-form').forEach((form) => {
+  form.addEventListener('submit', (event) => {
+    event.preventDefault();
+    const row = form.closest('.activity-row');
+    importActivity(row.dataset.athleteId, row.dataset.activityId, row);
+  });
+});
+
+const importAllForm = document.getElementById('import-all-form');
+if (importAllForm) {
+  importAllForm.addEventListener('submit', async (event) => {
+    event.preventDefault();
+
+    const button = importAllForm.querySelector('button');
+    const originalLabel = button ? button.textContent : '';
+    const rows = Array.from(
+      document.querySelectorAll('.activity-row:not(.done)')
+    );
+
+    if (button) button.disabled = true;
+
+    let done = 0;
+    for (const row of rows) {
+      const ok = await importActivity(
+        row.dataset.athleteId,
+        row.dataset.activityId,
+        row
+      );
+      if (ok) done += 1;
+      if (button) {
+        button.textContent =
+          'Importiere … (' + done + '/' + rows.length + ')';
+      }
+    }
+
+    if (button) {
+      button.textContent =
+        rows.length > 0
+          ? 'Fertig (' + done + '/' + rows.length + ')'
+          : originalLabel;
+    }
+  });
+}
+</script>
 </body>
 </html>"#,
     );
@@ -530,17 +670,26 @@ async fn sync_import_activity(
     State(state): State<AppState>,
     Path((athlete_id, activity_id)): Path<(String, String)>,
     jar: axum_extra::extract::cookie::CookieJar,
-) -> Result<Html<String>, (axum::http::StatusCode, String)> {
+    headers: HeaderMap,
+) -> Result<axum::response::Response, (axum::http::StatusCode, String)> {
     require_athlete_access(&state, &jar, &athlete_id)
         .await
         .map_err(http_error)?;
 
-    process_activity(state.clone(), athlete_id.clone(), activity_id.clone())
-        .await
-        .map_err(http_error)?;
+    let wants_json = wants_json_response(&headers);
 
-    Ok(Html(format!(
-        r#"<!doctype html>
+    match process_activity(state.clone(), athlete_id.clone(), activity_id.clone()).await {
+        Ok(crossings) => {
+            if wants_json {
+                Ok(Json(serde_json::json!({
+                    "status": "ok",
+                    "activity_id": activity_id,
+                    "crossings": crossings,
+                }))
+                .into_response())
+            } else {
+                Ok(Html(format!(
+                    r#"<!doctype html>
 <html lang="de">
 <head>
 <meta charset="utf-8">
@@ -557,10 +706,43 @@ Aktivität {} wurde importiert.
 </p>
 </body>
 </html>"#,
-        url_segment(&athlete_id),
-        html::escape(&activity_id),
-        url_segment(&athlete_id),
-    )))
+                    url_segment(&athlete_id),
+                    html::escape(&activity_id),
+                    url_segment(&athlete_id),
+                ))
+                .into_response())
+            }
+        }
+        Err(error) => {
+            if wants_json {
+                tracing::error!(
+                    error = ?error,
+                    activity_id = %activity_id,
+                    "activity import failed"
+                );
+
+                Ok((
+                    axum::http::StatusCode::INTERNAL_SERVER_ERROR,
+                    Json(serde_json::json!({
+                        "status": "error",
+                        "message": error.to_string(),
+                    })),
+                )
+                    .into_response())
+            } else {
+                Err(http_error(error))
+            }
+        }
+    }
+}
+
+/// True if the client explicitly asked for a JSON response (used by the
+/// AJAX import flow), rather than the classic full-page HTML fallback.
+fn wants_json_response(headers: &HeaderMap) -> bool {
+    headers
+        .get(ACCEPT)
+        .and_then(|value| value.to_str().ok())
+        .is_some_and(|value| value.contains("application/json"))
 }
 
 #[derive(Debug, Deserialize)]
@@ -743,7 +925,7 @@ pub async fn process_activity(
     state: AppState,
     intervals_athlete_id: String,
     activity_id: String,
-) -> Result<()> {
+) -> Result<usize> {
     let access_token: String = sqlx::query_scalar(
         r#"
         SELECT access_token
@@ -781,7 +963,7 @@ pub async fn process_activity_with_client(
     intervals_athlete_id: String,
     activity_id: String,
     client: &IntervalsClient,
-) -> Result<()> {
+) -> Result<usize> {
     let athlete = sqlx::query(
         r#"
         SELECT id
@@ -821,7 +1003,7 @@ pub async fn process_activity_with_client(
             points = points.len(),
             "activity has insufficient GPS data"
         );
-        return Ok(());
+        return Ok(0);
     }
 
     let mut tx = state.db.begin().await?;
@@ -863,7 +1045,7 @@ pub async fn process_activity_with_client(
         "activity processed"
     );
 
-    Ok(())
+    Ok(crossing_count)
 }
 
 fn parse_track(streams: &Value, start_time: DateTime<Utc>) -> Result<Vec<TrackPoint>> {
diff --git a/src/webhook.rs b/src/webhook.rs
index fab543e..4e12c80 100644
--- a/src/webhook.rs
+++ b/src/webhook.rs
@@ -59,14 +59,21 @@ pub async fn receive(
     let state_clone = state.clone();
 
     tokio::spawn(async move {
-        if let Err(error) =
-            crate::process_activity(state_clone, athlete_id, activity_id.clone()).await
-        {
-            tracing::error!(
-                %error,
-                activity_id = %activity_id,
-                "failed to process webhook activity"
-            );
+        match crate::process_activity(state_clone, athlete_id, activity_id.clone()).await {
+            Ok(crossings) => {
+                tracing::info!(
+                    activity_id = %activity_id,
+                    crossings,
+                    "webhook activity processed"
+                );
+            }
+            Err(error) => {
+                tracing::error!(
+                    %error,
+                    activity_id = %activity_id,
+                    "failed to process webhook activity"
+                );
+            }
         }
     });
 
