diff --git a/.gitignore b/.gitignore
index 73a8dc4..01afe47 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 /cmake-build-release
 /cmake-build-release-visual-studio
 /.idea
+/experiments
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 85c25ba..8629059 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ target_link_libraries(my_pendulum PRIVATE RLtools::RLtools)
 
 
 
-if(NOT MSVC)
+if(NOT MSVC AND CMAKE_BUILD_TYPE STREQUAL "Release")
     target_compile_options(my_pendulum PRIVATE -Ofast)
     if(NOT APPLE)
         target_compile_options(my_pendulum PRIVATE -march=native)
diff --git a/external/rl_tools b/external/rl_tools
index 3310fd1..623cfe4 160000
--- a/external/rl_tools
+++ b/external/rl_tools
@@ -1 +1 @@
-Subproject commit 3310fd1228e6c024613bc773161b46844b87b3df
+Subproject commit 623cfe4dcb8b908f98d70a85ccf926944060b09b
diff --git a/include/my_pendulum/operations_cpu.h b/include/my_pendulum/operations_cpu.h
new file mode 100644
index 0000000..353e356
--- /dev/null
+++ b/include/my_pendulum/operations_cpu.h
@@ -0,0 +1,94 @@
+namespace rl_tools{
+    template<typename DEVICE, typename SPEC>
+    std::string json(DEVICE& device, const MyPendulum<SPEC>& env, const typename MyPendulum<SPEC>::Parameters& parameters){
+        return "{}";
+    }
+
+    template<typename DEVICE, typename SPEC>
+    std::string json(DEVICE& device, const MyPendulum<SPEC>& env, const typename MyPendulum<SPEC>::Parameters& parameters, const typename MyPendulum<SPEC>::State& state){
+        std::string json = "{";
+        json += "\"theta\":" + std::to_string(state.theta) + ",";
+        json += "\"theta_dot\":" + std::to_string(state.theta_dot);
+        json += "}";
+        return json;
+    }
+    template <typename DEVICE, typename SPEC>
+    std::string get_ui(DEVICE& device, MyPendulum<SPEC>& env){
+        // just the body of `function render(ctx, state, action) {` (so that it can be easily processed by `new Function("ctx", "state", "action", body)`
+        std::string ui = R"RL_TOOLS_LITERAL(
+    ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
+
+    const centerX = ctx.canvas.width / 2;
+    const centerY = ctx.canvas.height / 2;
+    const canvasWidth = ctx.canvas.width;
+
+    const pendulumLength = canvasWidth * 0.2;
+    const bobRadius = canvasWidth * 0.02;
+    const pivotRadius = canvasWidth * 0.01;
+
+    // Draw the Pendulum
+    const adjustedTheta = state.theta - Math.PI;
+
+    const pendulumX = centerX + pendulumLength * Math.sin(adjustedTheta);
+    const pendulumY = centerY + pendulumLength * Math.cos(adjustedTheta);
+
+    ctx.beginPath();
+    ctx.moveTo(centerX, centerY);
+    ctx.lineTo(pendulumX, pendulumY);
+    ctx.lineWidth = canvasWidth * 0.008;
+    ctx.strokeStyle = 'black';
+    ctx.stroke();
+
+    ctx.beginPath();
+    ctx.arc(pendulumX, pendulumY, bobRadius, 0, 2 * Math.PI);
+    ctx.fillStyle = '#7DB9B6';
+    ctx.fill();
+    ctx.stroke();
+
+    ctx.beginPath();
+    ctx.arc(centerX, centerY, pivotRadius, 0, 2 * Math.PI);
+    ctx.fillStyle = 'black';
+    ctx.fill();
+    ctx.stroke();
+
+    // Draw torque arc
+    const torqueMagnitude = -Math.max(-1, Math.min(action[0], 1));
+    const arrowRadius = canvasWidth * 0.08;
+    const magnitudeRadians = (Math.PI * 2 / 3 * torqueMagnitude);
+    const startAngle = Math.PI / 2 + (torqueMagnitude > 0 ? 0 : magnitudeRadians);
+    const endAngle = Math.PI / 2 + (torqueMagnitude < 0 ? 0 : magnitudeRadians);
+
+    ctx.beginPath();
+    ctx.arc(centerX, centerY, arrowRadius, startAngle, endAngle);
+    ctx.strokeStyle = 'black';
+    ctx.lineWidth = canvasWidth * 0.008;
+    ctx.stroke();
+
+    // Draw arrowhead
+    const arrowAngle = torqueMagnitude > 0 ? endAngle : startAngle;
+    const arrowHeadAngularOffset = torqueMagnitude * Math.PI/180*20
+    const arrowX = centerX + arrowRadius * Math.cos(arrowAngle + arrowHeadAngularOffset);
+    const arrowY = centerY + arrowRadius * Math.sin(arrowAngle + arrowHeadAngularOffset);
+
+    const headlen = canvasWidth * 0.04 * Math.min(Math.abs(torqueMagnitude)*2, 1);
+    const angleOffset = Math.PI / 6;
+    const rotationAngle = Math.PI / 2 + (torqueMagnitude > 0 ? 0 : Math.PI);
+
+    ctx.beginPath();
+    ctx.moveTo(arrowX, arrowY);
+    ctx.lineTo(
+        arrowX - headlen * Math.cos(arrowAngle + arrowHeadAngularOffset/2 - angleOffset + rotationAngle),
+        arrowY - headlen * Math.sin(arrowAngle + arrowHeadAngularOffset/2 - angleOffset + rotationAngle)
+    );
+    ctx.lineTo(
+        arrowX - headlen * Math.cos(arrowAngle + arrowHeadAngularOffset/2 + angleOffset + rotationAngle),
+        arrowY - headlen * Math.sin(arrowAngle + arrowHeadAngularOffset/2 + angleOffset + rotationAngle)
+    );
+    ctx.lineTo(arrowX, arrowY);
+    ctx.fillStyle = 'black';
+    ctx.fill();
+        )RL_TOOLS_LITERAL";
+        return ui;
+    }
+
+}
\ No newline at end of file
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..ad623b8
--- /dev/null
+++ b/index.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <h1>RLtools</h1>
+    </head>
+    <body>
+        <a href="./external/rl_tools/static/extrack_ui?experiments=/experiments/"><b>EX</b>periement <b>TRACK</b>ing UI</a>
+    </body>
+    <script>
+        window.addEventListener('load', () => {
+
+        })
+    </script>
+</html>
diff --git a/serve.sh b/serve.sh
new file mode 100755
index 0000000..83a5c9f
--- /dev/null
+++ b/serve.sh
@@ -0,0 +1,3 @@
+set -e
+watch -n10 ./external/rl_tools/tools/index_experiments_static.sh experiments &
+python3 -m http.server $@
diff --git a/src/main.cpp b/src/main.cpp
index 1fffed8..d2c5867 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4,11 +4,13 @@
 
 #include "../include/my_pendulum/my_pendulum.h"
 #include "../include/my_pendulum/operations_generic.h"
+#include "../include/my_pendulum/operations_cpu.h" // JSON conversion functions for the rl::loop::steps::save_trajectories step (stored according to the experiment tracking specification: https://docs.rl.tools/10-Experiment%20Tracking.html)
 
 #include <rl_tools/rl/algorithms/ppo/loop/core/config.h>
 #include <rl_tools/rl/algorithms/ppo/loop/core/operations_generic.h>
-#include <rl_tools/rl/loop/steps/evaluation/config.h>
+#include <rl_tools/rl/loop/steps/extrack/operations_cpu.h>
 #include <rl_tools/rl/loop/steps/evaluation/operations_generic.h>
+#include <rl_tools/rl/loop/steps/save_trajectories/operations_cpu.h>
 
 namespace rlt = rl_tools;
 
@@ -40,7 +42,17 @@ struct LOOP_EVAL_PARAMETERS: rlt::rl::loop::steps::evaluation::Parameters<T, TI,
     static constexpr TI N_EVALUATIONS = NEXT::CORE_PARAMETERS::STEP_LIMIT / EVALUATION_INTERVAL;
 };
 #ifndef BENCHMARK
-using LOOP_CONFIG = rlt::rl::loop::steps::evaluation::Config<LOOP_CORE_CONFIG, LOOP_EVAL_PARAMETERS<LOOP_CORE_CONFIG>>;
+using LOOP_EXTRACK_CONFIG = rlt::rl::loop::steps::extrack::Config<LOOP_CORE_CONFIG>; // Sets up the experiment tracking structure (https://docs.rl.tools/10-Experiment%20Tracking.html)
+using LOOP_EVALUATION_CONFIG = rlt::rl::loop::steps::evaluation::Config<LOOP_EXTRACK_CONFIG, LOOP_EVAL_PARAMETERS<LOOP_EXTRACK_CONFIG>>; // Evaluates the policy in a fixed interval and logs the return
+struct LOOP_SAVE_TRAJECTORIES_PARAMETERS: rlt::rl::loop::steps::save_trajectories::Parameters<T, TI, LOOP_EVALUATION_CONFIG>{
+    static constexpr TI INTERVAL_TEMP = LOOP_CORE_CONFIG::CORE_PARAMETERS::STEP_LIMIT / 10;
+    static constexpr TI INTERVAL = INTERVAL_TEMP == 0 ? 1 : INTERVAL_TEMP;
+    static constexpr TI NUM_EPISODES = 10;
+};
+using LOOP_SAVE_TRAJECTORIES_CONFIG = rlt::rl::loop::steps::save_trajectories::Config<LOOP_EVALUATION_CONFIG, LOOP_SAVE_TRAJECTORIES_PARAMETERS>; // Saves trajectories for replay with the extrack UI
+using LOOP_TIMING_CONFIG = rlt::rl::loop::steps::timing::Config<LOOP_SAVE_TRAJECTORIES_CONFIG>;
+using LOOP_CONFIG = LOOP_TIMING_CONFIG;
+
 #else
 using LOOP_CONFIG = LOOP_CORE_CONFIG;
 #endif
@@ -54,6 +66,10 @@ int main(){
     DEVICE device;
     TI seed = 1337;
     LOOP_STATE ls;
+#ifndef BENCHMARK
+    // Set experiment tracking info
+    ls.extrack_name = "example";
+#endif
     rlt::malloc(device, ls);
     rlt::init(device, ls, seed);
     ls.actor_optimizer.parameters.alpha = 1e-2;