Open Water Swim: River Current Adaptation Session

Session Overview

Most open water sessions assume still lake or sea water, but a growing number of races — river swims, tidal estuary starts, some point-to-point courses — put you in genuinely moving water. Swimming against a current changes your stroke rate and sighting rhythm; swimming with one changes your pacing perception completely. This 45-minute session builds the specific skills for both, ideally done in a safe, lifeguarded river or tidal stretch with a clear entry and exit point.

What You’ll Need

• Wetsuit (unless racing non-wetsuit and acclimatised)
• Tow float — non-negotiable for moving water
• A known, safe stretch of river or tidal water with a clearly identifiable current direction and an easy exit
• A swim buddy or safety cover — never do this session solo

Warm-Up (10 minutes)

Enter in the calmest available water and swim 400m easy, alternating 50m sighting drills with 50m relaxed freestyle. Use this time to read the current — watch how debris or ripples move on the surface, and identify your reference points on the bank for sighting.

Main Set

Work a fixed stretch of the current, swimming upstream and downstream so you feel both effects directly.

• Set 1 — Against the current: 4 x 2 minutes swimming upstream at a strong, sustainable effort, focusing on a higher stroke rate rather than longer, slower strokes. 30 seconds rest, treading water or holding the bank.
• Set 2 — With the current: 4 x 2 minutes swimming downstream at the same perceived effort as Set 1, paying attention to how much faster you’re actually moving relative to the bank — your effort should feel similar, but your pace will be noticeably higher.
• Set 3 — Angled crossing: 4 x 1 minute swimming at a 45-degree angle across the current, simulating a river crossing where you need to aim upstream of your actual exit point to land where you intend.

Cool-Down (10 minutes)

Return to the calm water you started in and swim 300-400m easy, focusing on relaxed, full-length strokes to flush out the higher stroke rate from the main set.

Coaching Notes

• In a race with current, your exit point isn’t where you’d land swimming in a straight line — always aim upstream of your intended exit and let the current carry you the rest of the way.
• A common mistake is panicking when swimming against a current and feeling like you’re not moving — trust your effort and stroke rate rather than your perceived progress against the bank.
• Scale down: if you’re newer to open water, do this session in a marked, slower-flowing section with a safety kayak, and cut the main set to 3 rounds instead of 4.
• RPE guidance: Set 1 should feel like 7-8/10 effort; Set 2 should feel similar in effort even though you’re moving faster — resist the temptation to ease off just because the pace feels easy.
• Never attempt this session in flood conditions, after heavy rain, or without confirming current speed and safety with someone who knows the venue.