My code

using GTA;
using System;
using System.Windows.Forms;

public class Modification : Script
{
    public Modification()
    {
        Tick += OnTick;
        KeyDown += OnKeyDown;
        KeyUp += OnKeyUp;

        Interval = 10;
    }

    // Benches coords
    GTA.Math.Vector3[] weightBenches = new GTA.Math.Vector3[] {
            new GTA.Math.Vector3(-1201.322f, -1574.971f, 4.074069f)
        };

    // Benches rotation
    float[] weightBenchesR = new float[] {
            180
        };

    float maxDistance = 2f;

    void OnTick(object sender, EventArgs e)
    {

    }

    void OnKeyDown(object sender, KeyEventArgs e)
    {

    }

    void OnKeyUp(object sender, KeyEventArgs e)
    {
        Player player = Game.Player;
        Ped playerped = player.Character;
        //UI.Notify(player.Position.ToString());
        if (e.KeyCode == Keys.L)
        {
            //Game.FadeScreenOut(1000);
            //player.CanControlCharacter = false;
            //Wait(1000);
            //playerped.Task.ClearAllImmediately();
            //playerped.Task.StartScenario("WORLD_HUMAN_PUSH_UPS", playerped.Position);
            //Wait(100);
            //player.CanControlCharacter = true;
            //Game.FadeScreenIn(1000);
            for(int i = 0; i < weightBenches.Length; i++)
            {
                if(weightBenches[i].DistanceTo(playerped.Position) < maxDistance)
                {
                    Animation("PROP_HUMAN_SEAT_MUSCLE_BENCH_PRESS", weightBenches[i], weightBenchesR[i]);
                }
            }
        } else if(e.KeyCode == Keys.K)
        {
            playerped.Task.ClearAll();
        } else if(e.KeyCode == Keys.R)
        {
            // Just for check coords and rotation
            UI.Notify(playerped.Rotation);
            UI.ShowSubtitle(playerped.Position.ToString());
        }
    }

    void Animation(String scenario, GTA.Math.Vector3 position, float rotation)
    {
        Player player = Game.Player;
        Ped playerped = player.Character;
        Game.FadeScreenOut(1000);
        player.CanControlCharacter = false;
        Wait(1000);
        playerped.Task.ClearAllImmediately();
        playerped.Task.StartScenario(scenario, position);
        playerped.Heading = rotation;
        Wait(100);
        player.CanControlCharacter = true;
        Game.FadeScreenIn(1000);
    }
}