How to get flushleft to the page margin within enumerate environment?

Question

How do I get the headings to come to the page margin inside of the enumerate envirnoment.

\documentclass{article}
\usepackage{lipsum}
\begin{document}
\begin{flushleft}
Heading
\end{flushleft}
\begin{enumerate}
\item \lipsum[10]
\begin{flushleft}
Heading
\end{flushleft}
\item \lipsum[10]
\noindent\begin{flushleft}
Heading
\end{flushleft}
\item \lipsum[10]
\end{enumerate}
\end{document}

Answer 1

Try for instance this.

\documentclass{article}

\usepackage{lipsum}
\usepackage{enumitem}

\begin{document}

\begin{flushleft}
  Heading
\end{flushleft}
\begin{enumerate}
\item \lipsum[10]
\end{enumerate}

\begin{flushleft}
  Heading
\end{flushleft}
\begin{enumerate}[resume]
\item \lipsum[10]
\end{enumerate}

\begin{flushleft}
  Heading
\end{flushleft}
\begin{enumerate}[resume]
\item \lipsum[10]
\end{enumerate}

\end{document}

Note also that using flushleft for headings is not necessarily the best possible idea.