Table going off page

Question

I'm unable to keep my table on the page, not sure how to fix it. Help appreciated.

Here is my table:

\begin{landscape}
\begin{tabular}{|c|c|c|c|c|c|c|}
\multicolumn{7}{c}{\textbf{Data from testing}}\
\hline
\multicolumn{2}{|c|}{Population information}&\multicolumn{3}{c|}{Anaerobic power data}&\multicolumn{2}{c|}{Anaerobic endurance data}\
\hline
\multirow{2}{}{Participant number, age, and weight}&\multirow{2}{}{Status}&\multicolumn{2}{c|}{Power clean}&\multirow{2}{}{Broad jump (m)}&\multirow{2}{}{500m row (minutes:seconds)}&Air bike 50 cal (seconds)\
\cline{3-4}
&&kg&%bw&&&\
\hline
\multicolumn{7}{|c|}{Trained sprinter}\
\hline

Male, 24, 72 kg.&National level sprinter - 100m&130&1.8&2.1&1:34&7\

\hline
2. Male, 22, 75 kg.&National level sprinter - 200m&105&1.4&2.2&1:32&7\
\hline
3. Male, 25, 78 kg.&National level sprinter - 400m&90&1.2&1.9&1:2&7\
\hline
4. Male, 24, 74 kg.&Recreational sprinter&85&1.1&1.7&1:38&7\
\hline
5. Male, 23, 68 kg.&Recreational sprinter&70&1.0&1.9&1:41&7\
\hline
\multicolumn{7}{|c|}{Untrained sprinter}\
\hline
6. Female, 27, 47 kg.&Recreational Olympic weightlifter&50&1.1&1.6&6&7\
\hline
7. Male, 25, 82 kg.&Recreational jogging and gym&55&0.67&1.7&6&7\
\hline
8. Male, 32, 77 kg.&Daily walks&35&0.45&1.3&6&7\
\hline
9. Male, 26, 86 kg.&Inactive&30&0.35&1.2&6&7\
\hline
10. Female, 33, 74 kg.&Inactive&20 (empty bar)&0.27&0.7&6&7\
\hline
\hline
\multicolumn{7}{|c|}{Statistical values - trained}\
\hline
mean&2&3&4&5&6&7\
\hline
standard deviation&2&3&4&5&6&7\
\hline
\end{tabular}

Answer 1

You can use p-type columns (or X-type with tabularx). Or just split long cell contents on multiple lines. In addition, I suggest to use booktabs to prettify your tabular; use caption to add the title.

\documentclass{report}
\usepackage{multirow}
\usepackage{pdflscape}
\usepackage{booktabs}
\begin{document}
\begin{landscape}
  \begin{tabular}{|c|c|c|c|c|c|c|}

  \multicolumn{7}{c}{\textbf{Data from testing}}\\
  \hline
  \multicolumn{2}{|c|}{Population information}&\multicolumn{3}{c|}{Anaerobic power data}&\multicolumn{2}{c|}{Anaerobic endurance data}\\
  \hline

%      \multirow{2}{}{Participant number, age, and weight}&\multirow{2}{}{Status}&\multicolumn{2}{c|}{Power clean}&\multirow{2}{}{Broad jump (m)}&\multicolumn{1}{m{2cm}|}{{500m row\par(minutes:seconds)}}&Air bike 50 cal (seconds)\
      Participant number&\multirow{2}{}{Status}&\multicolumn{2}{c|}{Power clean}&Broad jump&500m row&Air bike 50 cal \
      \cline{3-4}
      age, and weight&&kg&%bw&(m)&(minutes:seconds)&(seconds)\
      \hline
      \multicolumn{7}{|c|}{Trained sprinter}\
      \hline
      1. Male, 24, 72 kg.&National level sprinter - 100m&130&1.8&2.1&1:34&7\
      \hline
      2. Male, 22, 75 kg.&National level sprinter - 200m&105&1.4&2.2&1:32&7\
      \hline
      3. Male, 25, 78 kg.&National level sprinter - 400m&90&1.2&1.9&1:2&7\
      \hline
      4. Male, 24, 74 kg.&Recreational sprinter&85&1.1&1.7&1:38&7\
      \hline
      5. Male, 23, 68 kg.&Recreational sprinter&70&1.0&1.9&1:41&7\
      \hline
      \multicolumn{7}{|c|}{Untrained sprinter}\
      \hline
      6. Female, 27, 47 kg.&Recreational Olympic weightlifter&50&1.1&1.6&6&7\
      \hline
      7. Male, 25, 82 kg.&Recreational jogging and gym&55&0.67&1.7&6&7\
      \hline
      8. Male, 32, 77 kg.&Daily walks&35&0.45&1.3&6&7\
      \hline
      9. Male, 26, 86 kg.&Inactive&30&0.35&1.2&6&7\
      \hline
      10. Female, 33, 74 kg.&Inactive&20 (empty bar)&0.27&0.7&6&7\
      \hline
      \hline
      \multicolumn{7}{|c|}{Statistical values - trained}\
      \hline
      mean&2&3&4&5&6&7\
      \hline
      standard deviation&2&3&4&5&6&7\
      \hline
\end{tabular}

\end{landscape}
\begin{landscape}
  \begin{table}
    \caption{Data from testing}
    \begin{tabular}{@{}{7}{c}@{}}
      \toprule
      \multicolumn{2}{c}{Population information} & \multicolumn{3}{c}{Anaerobic power data} & \multicolumn{2}{c}{Anaerobic endurance data}\
      Participant number&\multirow{2}{}{Status}&\multicolumn{2}{c}{Power clean}&Broad jump&500m row&Air bike 50 cal \
%      \cline{3-4}
      age, and weight&&kg&%bw&(m)&(minutes:seconds)&(seconds)\
      \midrule
      \multicolumn{7}{c}{Trained sprinter}\
      1. Male, 24, 72 kg.&National level sprinter - 100m&130&1.8&2.1&1:34&7\
      2. Male, 22, 75 kg.&National level sprinter - 200m&105&1.4&2.2&1:32&7\
      3. Male, 25, 78 kg.&National level sprinter - 400m&90&1.2&1.9&1:2&7\
      4. Male, 24, 74 kg.&Recreational sprinter&85&1.1&1.7&1:38&7\
      5. Male, 23, 68 kg.&Recreational sprinter&70&1.0&1.9&1:41&7\
      \midrule
      \multicolumn{7}{c}{Untrained sprinter}\
      6. Female, 27, 47 kg.&Recreational Olympic weightlifter&50&1.1&1.6&6&7\
      7. Male, 25, 82 kg.&Recreational jogging and gym&55&0.67&1.7&6&7\
      8. Male, 32, 77 kg.&Daily walks&35&0.45&1.3&6&7\
      9. Male, 26, 86 kg.&Inactive&30&0.35&1.2&6&7\
      10. Female, 33, 74 kg.&Inactive&20 (empty bar)&0.27&0.7&6&7\
      \midrule
      \multicolumn{7}{c}{Statistical values - trained}\
      mean&2&3&4&5&6&7\
      standard deviation&2&3&4&5&6&7\
      \bottomrule
\end{tabular}
  \end{table}
    \end{landscape}
\end{document}

Answer 2

I propose a solution with the makecell & geometry packages (the latter to have more decent margins, if you don't use marginal notes). I added some improvements as regards the vertical spacing in table, with the cellspace package:

    \documentclass{article}
    \usepackage{geometry}
    \usepackage{multirow, array}
    \usepackage{lscape}
    \usepackage{makecell}
    \usepackage{cellspace}
    \setlength{\cellspacetoplimit}{4pt}
    \setlength{\cellspacebottomlimit}{4pt}
\begin{document}

\begin{landscape}
\centering
\begin{tabular}{|*{7}{Sc|}}
\multicolumn{7}{Sc}{\textbf{Data from testing}}\\
\hline
\multicolumn{2}{|Sc|}{Population information}&\multicolumn{3}{Sc|}{Anaerobic power data}&\multicolumn{2}{Sc|}{Anaerobic endurance data}\\
\hline
\multirowcell{2}{Participant number,\\ age and weight}&\multirow{2}{*}{Status}&\multicolumn{2}{c|}{Power clean}&\multirowcell{2}{Broad jump \\ (m)}&\multirowcell{2}{500m row\\ (minutes:seconds)}& \makecell{Air bike \\ 50 cal \\(seconds)}\\
\cline{3-4}
&&kg&\%bw&&&\\
\hline
\multicolumn{7}{|Sc|}{Trained sprinter}\\
\hline
1. Male, 24, 72 kg.& \makecell{National level sprinter\\– 100m} &130&1.8&2.1&1:34&7\\
\hline
2. Male, 22, 75 kg.& \makecell{National level sprinter\\– 200m}&105&1.4&2.2&1:32&7\\
\hline
3. Male, 25, 78 kg.&\makecell{National level sprinter\\– 400m}&90&1.2&1.9&1:2&7\\
\hline
4. Male, 24, 74 kg.& Recreational sprinter &85&1.1&1.7&1:38&7\\
\hline
5. Male, 23, 68 kg.& Recreational sprinter &70&1.0&1.9&1:41&7\\
\hline
\multicolumn{7}{|Sc|}{Untrained sprinter}\\
\hline
6. Female, 27, 47 kg.& \makecell{Recreational\\ Olympic weightlifter}&50&1.1&1.6&6&7\\
\hline
7. Male, 25, 82 kg.& \makecell{Recreational\\ jogging and gym}&55&0.67&1.7&6&7\\
\hline
8. Male, 32, 77 kg.& Daily walks &35&0.45&1.3&6&7\\
\hline
9. Male, 26, 86 kg.& Inactive &30&0.35&1.2&6&7\\
\hline
10. Female, 33, 74 kg.& Inactive & 20 (empty bar)&0.27&0.7&6&7\\
\hline
\hline
\multicolumn{7}{|Sc|}{Statistical values - trained}\\
\hline
mean&2&3&4&5&6&7\\
\hline
standard deviation&2&3&4&5&6&7\\
\hline
\end{tabular}
\end{landscape}

\end{document}