--- a
+++ b/examples/sim_L2M2019_randomrun.py
@@ -0,0 +1,33 @@
+from osim.env import L2M2019Env
+import numpy as np
+
+#=== this is the official setting for Learn to Move 2019 ===#
+model = '3D'
+#round_n = 1 # Round 1
+round_n = 2 # Round 2
+
+if round_n == 1:
+    difficulty = 2 # 2: Round 1; 3: Round 2
+    seed = None
+    project = True
+    obs_as_dict = True
+elif round_n == 2:
+    difficulty = 3 # 2: Round 1; 3: Round 2
+    seed = None
+    project = True
+    obs_as_dict = True
+else:
+    difficulty = 1 # 0: constant forward velocities; 1: consecutive sinks forward for walking
+    seed = None
+    project = True
+    obs_as_dict = True
+#=== this is the official setting for Learn to Move 2019 ===#
+
+env = L2M2019Env(seed=seed, difficulty=difficulty)
+env.change_model(model=model, difficulty=difficulty, seed=seed)
+obs_dict = env.reset(project=project, seed=seed, obs_as_dict=obs_as_dict)
+
+while True:
+    obs_dict, reward, done, info=env.step(env.action_space.sample(), project=project, obs_as_dict=obs_as_dict)
+    if done:
+        break