http://www.sportsinjuryclinic.net/sport-injuries/ankle-achilles-shin-pain/tight-calf-muscles/sports-massage-tight-calves
Stripping the muscle
Aim - to apply sustained pressure to the muscle, ironing out any lumps, bumps and knots.
With both thumbs together, apply deep pressure up the middle of the calf muscle aiming to separate the heads (sides) of the big gastrocnemius muscle.
This technique should be slow and deliberate to 'feel' the muscle underneath.
Repeat this 3 to 5 times in a row, alternating with petrissage for 3 to 5 minutes
Another similar technique is applied with a single thumb, which can be reinforced with a couple of fingers from the other hand if more pressure is required.
A great deal of pressure can be applied with this technique. Massage should be deep but not so deep that the athlete tightens up with pain.
Aim to cover all the muscles in the lower leg, feeling for all the lumps and bumps.