Note that by using a font that sports a uniform character width, you can more easily get the exact alignment for that table layout look:
Leg presses on 45* sled....................400x8x5
Sissy squats................................BWx8x3
Seated leg extensions......................120x8x3
Lying leg curls................133x8, 130x8, 130x6
Hyperextensions.............................25x8x3
Standing calf raise machine...............300x10x3
In the block of text above, the font was changed to Courier New, using the formatting options in the 'Reply to Thread' dialog. Simply highlight your text, then change the font using the drop-down font menu. Obviously, you'll only want to change the font for this table portion of your post.
Note that you can get a similar look by using dashes or underscores or any padding character (except a space character):
Leg presses on 45* sled--------------------400x8x5
Sissy squats--------------------------------BWx8x3
Seated leg extensions----------------------120x8x3
Lying leg curls_______________130x10, 130x8, 130x6
Hyperextensions_____________________________25x8x3
Standing calf raise machine_______________300x10x3
It's a little bit awkward to create your table of info using the 'Reply to Thread' dialog since you're not actually working with the Courier New font (but rather Arial ... or whatever font is standard for your system). One thing that you might do would be to actually create the workout portion of your post using an word processing application that allows for the use of Courier New (or any uniform character width font). This will allow you to visually get your spacing correct. Then simply copy/paste into the 'Reply to Thread' dialog. After performing the paste, you'll then need to use the drop-down font menu, as noted above.
Oh ... one last note. I've noticed that the longer you make your lines, the greater the chance is of having the forum software somehow toss in an extra space character. It doesn't seem to be any specific number of characters:
Seated leg extensions.....................................120 x8x3
.........1.........2.........3.........4.........5 .........6
12345678901234567890123456789012345678901234567890 1234567890