diff --git a/emg_data_walking.mat b/emg_data_walking.mat
new file mode 100644
index 0000000000000000000000000000000000000000..3dbc1360c655032cd7158c543b9472aabb18a3a7
Binary files /dev/null and b/emg_data_walking.mat differ
diff --git a/main.py b/main.py
index ef6a5e6521a864f28512e70b946238adadd6937c..959c90c34287c4449362725f51cfabe6aa435904 100644
--- a/main.py
+++ b/main.py
@@ -23,3 +23,9 @@ def load_emg_data(file_path):
 
 file_path = "emg_data_walking.mat"
 load_emg_data(file_path)
+
+chosen_muscles = {
+    'rectus_fomoris': 0,
+    'tibialis_anterior': 7
+}
+print(f"Gekozen spieren: {chosen_muscles}")
\ No newline at end of file
diff --git a/vraag3.py b/vraag3.py
new file mode 100644
index 0000000000000000000000000000000000000000..088a5c0ef878f02fead63956a28daecd7f72b69c
--- /dev/null
+++ b/vraag3.py
@@ -0,0 +1,2 @@
+t = "hoi"
+print(t)
\ No newline at end of file
diff --git a/vraag4.py b/vraag4.py
new file mode 100644
index 0000000000000000000000000000000000000000..c42b30ee84055f8d57e0abbb047433fb8e75afa4
--- /dev/null
+++ b/vraag4.py
@@ -0,0 +1,8 @@
+import numpy as np
+import scipy.signal as signal
+
+class Dataretrieval:
+    def __init__(self, filiepath: str):
+        self.filepath = filepath
+        self.data = None
+        self.sampling_rate
\ No newline at end of file