This is what I have so far:

jQuery(document).ready(function () {
    jQuery("#list").jqGrid({
        datatype: processrequest,
        mtype: 'POST',
        jsonReader: {
            root: "ListExercise", //arry containing actual data  
            page: "Page", //current page  
            total: "Total", //total pages for the query  
            records: "Records", //total number of records  
            repeatitems: false,
            id: "ID" //index of the column with the PK in it   
        },
        colNames: ['Id', 'Exercise'],
        colModel: [
      { name: 'exercise_id', index: 'exercise_id',editable:false },
      { name: 'exercise_value', index: 'exercise_value',editable:true }
      ],
        caption: 'MyFitnessApplication',
        pager: '#pager',
        rowNum: 10,
        rowList: [10, 20, 30],
        sortorder: "desc",
        viewrecords: true,
        height: '250px',
        loadonce: true,
        editurl: "../webService/exercise_ws.asmx/insertRecord"      
    }).navGrid('#pager', { edit: true, add: true, del: false });
});