import SwiftUI
import PlaygroundSupport
import Foundation

struct ContentView: View {
    @State var minutesOfTraining = 10
    var body: some View {
        VStack {
            HStack {
                Button(action: {
                    self.minutesOfTraining -= 1
                }) {
                    Text("-")
                }

                Button(action: {
                    self.minutesOfTraining += 1
                }) {
                    Text("+")
                }

            }
            Text("\(minutesOfTraining) min.")
        }
    }
}

PlaygroundPage.current.setLiveView(ContentView())

I want to update the Text() to the current value of minutesOfTraining, after changing it with the button. What can i do?