PyQt5 using 2 .show() can't get ride of either one - user-interface

Question

PyQt5 App, I am building this app and had to use 2 .show(), 2 GUI show up when I run the code. One blank GUI and with with my information. When I remove the first .show() only the blank GUI shows up when I remove the second one nothing shows up any ideas.
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QGridLayout, `enter code here`QLineEdit, QLabel
from PyQt5.QtWidgets import QPushButton, QVBoxLayout, QFormLayout, QPushButton, `enter code here`QTableWidget, QTableWidgetItem
from PyQt5.QtCore import Qt
import sqlite3
class ExerciseTracker(QWidget):
def __init__(self):
super().__init__()
self.myWindow = QWidget()
self.title = 'Exercise Tracker'
self.setWindowTitle(self.title)
self.setGeometry(200, 400, 300, 200)
self.move(60, 15)
self.layout = QFormLayout()
self.layout.addRow(QLabel('<h2>Welcome to the App!</h2>', parent=self.myWindow))
line_edit1 = QLineEdit()
self.layout.addRow('Day of the week: ', line_edit1)
line_edit2 = QLineEdit()
self.layout.addRow('Body Part: ', line_edit2)
line_edit3 = QLineEdit()
self.layout.addRow('Input Exercise: ', line_edit3)
line_edit4 = QLineEdit()
self.layout.addRow('Input Sets: ', line_edit4)
line_edit5 = QLineEdit()
self.layout.addRow('Input Reps: ', line_edit5)
btn1 = QPushButton('Submit')
self.layout.addRow(btn1)
btn2 = QPushButton('Show Records')
self.layout.addRow(btn2)
self.myWindow.setLayout(self.layout)
self.myWindow.show()
def main():
exercise = QApplication(sys.argv)
view = ExerciseTracker()
view.show()
sys.exit(exercise.exec_())
if __name__ =='__main__':
main()